diff --git a/teavm-classlib/src/main/java/org/teavm/classlib/java/text/TDecimalFormat.java b/teavm-classlib/src/main/java/org/teavm/classlib/java/text/TDecimalFormat.java
index 50d16ad12..d39248c14 100644
--- a/teavm-classlib/src/main/java/org/teavm/classlib/java/text/TDecimalFormat.java
+++ b/teavm-classlib/src/main/java/org/teavm/classlib/java/text/TDecimalFormat.java
@@ -25,7 +25,16 @@ import org.teavm.classlib.java.util.TLocale;
  * @author Alexey Andreev
  */
 public class TDecimalFormat extends TNumberFormat {
-    private TDecimalFormatSymbols symbols;
+    TDecimalFormatSymbols symbols;
+    private String positivePrefix;
+    private String negativePrefix;
+    private String positiveSuffix;
+    private String negativeSuffix;
+    private int multiplier;
+    private int groupingSize;
+    private boolean decimalSeparatorAlwaysShown;
+    private boolean parseBigDecimal;
+    int exponentDigits;
 
     public TDecimalFormat() {
         this(CLDRHelper.resolveDecimalFormat(TLocale.getDefault().getLanguage(), TLocale.getDefault().getCountry()));
@@ -47,8 +56,10 @@ public class TDecimalFormat extends TNumberFormat {
         super.setMinimumIntegerDigits(decimalData.getMinimumIntegerDigits());
     }
 
-    public void applyPattern(@SuppressWarnings("unused") String pattern) {
-
+    public void applyPattern(String pattern) {
+        TDecimalFormatParser parser = new TDecimalFormatParser();
+        parser.parse(pattern);
+        parser.apply(this);
     }
 
     public DecimalFormatSymbols getDecimalFormatSymbols() {
@@ -69,4 +80,111 @@ public class TDecimalFormat extends TNumberFormat {
     public StringBuffer format(double value, StringBuffer buffer, TFieldPosition field) {
         return null;
     }
+
+    public String getPositivePrefix() {
+        return positivePrefix;
+    }
+
+    public void setPositivePrefix(String newValue) {
+        positivePrefix = newValue;
+    }
+
+    public String getNegativePrefix() {
+        return negativePrefix;
+    }
+
+    public void setNegativePrefix(String newValue) {
+        negativePrefix = newValue;
+    }
+
+    public String getPositiveSuffix() {
+        return positiveSuffix;
+    }
+
+    public void setPositiveSuffix(String newValue) {
+        positiveSuffix = newValue;
+    }
+
+    public String getNegativeSuffix() {
+        return negativeSuffix;
+    }
+
+    public void setNegativeSuffix(String newValue) {
+        negativeSuffix = newValue;
+    }
+
+    public int getMultiplier() {
+        return multiplier;
+    }
+
+    public void setMultiplier(int newValue) {
+        multiplier = newValue;
+    }
+
+    public int getGroupingSize() {
+        return groupingSize;
+    }
+
+    public void setGroupingSize(int newValue) {
+        groupingSize = newValue;
+    }
+
+    public boolean isDecimalSeparatorAlwaysShown() {
+        return decimalSeparatorAlwaysShown;
+    }
+
+    public void setDecimalSeparatorAlwaysShown(boolean newValue) {
+        decimalSeparatorAlwaysShown = newValue;
+    }
+
+    public boolean isParseBigDecimal() {
+        return parseBigDecimal;
+    }
+
+    public void setParseBigDecimal(boolean newValue) {
+        parseBigDecimal = newValue;
+    }
+
+    @Override
+    public Object clone() {
+        return super.clone();
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj == this) {
+            return true;
+        }
+        if (!(obj instanceof TDecimalFormat)) {
+            return false;
+        }
+        TDecimalFormat other = (TDecimalFormat)obj;
+        if (!super.equals(obj)) {
+            return false;
+        }
+        return positivePrefix.equals(other.positivePrefix) &&
+                positiveSuffix.equals(other.positiveSuffix) &&
+                negativePrefix.equals(other.negativePrefix) &&
+                negativeSuffix.equals(other.negativeSuffix) &&
+                multiplier == other.multiplier &&
+                groupingSize == other.groupingSize &&
+                decimalSeparatorAlwaysShown == other.decimalSeparatorAlwaysShown &&
+                parseBigDecimal == other.parseBigDecimal &&
+                exponentDigits == other.exponentDigits;
+    }
+
+    @Override
+    public int hashCode() {
+        int result = super.hashCode();
+        result = result * 31 + positivePrefix.hashCode();
+        result = result * 31 + positiveSuffix.hashCode();
+        result = result * 31 + negativePrefix.hashCode();
+        result = result * 31 + negativeSuffix.hashCode();
+        result = result * 31 + multiplier;
+        result = result * 31 + groupingSize;
+        result = result * 31 + (decimalSeparatorAlwaysShown ? 1 : 0);
+        result = result * 31 + (parseBigDecimal ? 1 : 0);
+        result = result * 31 + exponentDigits;
+        return result;
+    }
 }
diff --git a/teavm-classlib/src/main/java/org/teavm/classlib/java/text/TDecimalFormatParser.java b/teavm-classlib/src/main/java/org/teavm/classlib/java/text/TDecimalFormatParser.java
new file mode 100644
index 000000000..7a17ef032
--- /dev/null
+++ b/teavm-classlib/src/main/java/org/teavm/classlib/java/text/TDecimalFormatParser.java
@@ -0,0 +1,241 @@
+/*
+ *  Copyright 2015 Alexey Andreev.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+package org.teavm.classlib.java.text;
+
+/**
+ *
+ * @author Alexey Andreev
+ */
+class TDecimalFormatParser {
+    private String positivePrefix;
+    private String positiveSuffix;
+    private String negativePrefix;
+    private String negativeSuffix;
+    private int groupSize;
+    private int minimumIntLength;
+    private int intLength;
+    private int minimumFracLength;
+    private int fracLength;
+    private int exponentLength;
+    private boolean decimalSeparatorRequired;
+    private String string;
+    private int index;
+
+    public void parse(String string) {
+        groupSize = 0;
+        minimumFracLength = 0;
+        fracLength = 0;
+        exponentLength = 0;
+        decimalSeparatorRequired = false;
+        this.string = string;
+        index = 0;
+        positivePrefix = parseText(false, false);
+        if (index == string.length()) {
+            throw new IllegalArgumentException("Positive number pattern not found in " + string);
+        }
+        parseNumber(true);
+        if (index < string.length() && string.charAt(index) != ';') {
+            positiveSuffix = parseText(true, false);
+        }
+        if (index < string.length()) {
+            if (string.charAt(index++) != ';') {
+                throw new IllegalArgumentException("Expected ';' at " + index + " in " + string);
+            }
+            negativePrefix = parseText(false, true);
+            parseNumber(false);
+            negativeSuffix = parseText(true, true);
+        }
+    }
+
+    public void apply(TDecimalFormat format) {
+        format.setPositivePrefix(positivePrefix);
+        format.setPositiveSuffix(positiveSuffix);
+        format.setNegativePrefix(negativePrefix != null ? negativePrefix :
+                format.symbols.getMinusSign() + positivePrefix);
+        format.setNegativeSuffix(negativeSuffix != null ? negativeSuffix : positiveSuffix);
+        format.setGroupingSize(groupSize);
+        format.setGroupingUsed(groupSize > 0);
+        format.setMinimumIntegerDigits(minimumIntLength);
+        format.setMaximumIntegerDigits(intLength);
+        format.setMinimumFractionDigits(minimumFracLength);
+        format.setMaximumFractionDigits(fracLength);
+        format.setDecimalSeparatorAlwaysShown(decimalSeparatorRequired);
+        format.exponentDigits = exponentLength;
+    }
+
+    private String parseText(boolean suffix, boolean end) {
+        StringBuilder sb = new StringBuilder();
+        loop: while (index < string.length()) {
+            char c = string.charAt(index);
+            switch (c) {
+                case '#':
+                case '0':
+                    if (suffix) {
+                        throw new IllegalArgumentException("Prefix contains special character at " + index + " in " +
+                                string);
+                    }
+                    break loop;
+                case ';':
+                    if (end) {
+                        throw new IllegalArgumentException("Prefix contains special character at " + index + " in " +
+                                string);
+                    }
+                    break loop;
+                case '.':
+                case 'E':
+                    throw new IllegalArgumentException("Prefix contains special character at " + index + " in " +
+                            string);
+                case '\'': {
+                    ++index;
+                    int next = string.indexOf('\'', index);
+                    if (next < 0) {
+                        throw new IllegalArgumentException("Quote opened at " + index + " was not closed in " +
+                                string);
+                    }
+                    if (next == index) {
+                        sb.append('\'');
+                    } else {
+                        sb.append(string.substring(index, next));
+                    }
+                    index = next + 1;
+                    break;
+                }
+                default:
+                    sb.append(c);
+                    ++index;
+                    break;
+            }
+        }
+        return sb.toString();
+    }
+
+    private void parseNumber(boolean apply) {
+        parseIntegerPart(apply);
+        if (index < string.length() && string.charAt(index) == '.') {
+            ++index;
+            parseFractionalPart(apply);
+        }
+        if (index < string.length() && string.charAt(index) == 'E') {
+            ++index;
+            parseExponent(apply);
+        }
+    }
+
+    private void parseIntegerPart(boolean apply) {
+        int lastGroup = index;
+        boolean optionalDigits = true;
+        int length = 0;
+        int minimumLength = 0;
+        loop: while (index < string.length()) {
+            switch (string.charAt(index)) {
+                case '#':
+                    if (!optionalDigits) {
+                        throw new IllegalArgumentException("Unexpected '#' at non-optional digit part at " + index +
+                                " in " + string);
+                    }
+                    ++length;
+                    break;
+                case ',':
+                    if (lastGroup + 1 == index) {
+                        throw new IllegalArgumentException("Two commas at " + index + " in " + string);
+                    }
+                    if (apply) {
+                        groupSize = index - lastGroup;
+                    }
+                    break;
+                case '0':
+                    optionalDigits = false;
+                    ++length;
+                    ++minimumLength;
+                    break;
+                default:
+                    break loop;
+            }
+            ++index;
+        }
+        if (length == 0) {
+            throw new IllegalArgumentException("Pattern does not specify integer digits at " + index +
+                    " in " + string);
+        }
+        if (apply) {
+            intLength = length;
+            minimumIntLength = minimumLength;
+        }
+    }
+
+    private void parseFractionalPart(boolean apply) {
+        boolean optionalDigits = false;
+        int length = 0;
+        int minimumLength = 0;
+        loop: while (index < string.length()) {
+            switch (string.charAt(index)) {
+                case '#':
+                    ++length;
+                    optionalDigits = true;
+                    break;
+                case ',':
+                    throw new IllegalArgumentException("Group separator found at fractional part at " + index +
+                            " in " + string);
+                case '0':
+                    if (!optionalDigits) {
+                        throw new IllegalArgumentException("Unexpected '0' at optional digit part at " + index +
+                                " in " + string);
+                    }
+                    ++length;
+                    ++minimumLength;
+                    break;
+                case '.':
+                    throw new IllegalArgumentException("Unexpected second decimal separator at " + index +
+                            " in " + string);
+                default:
+                    break loop;
+            }
+            ++index;
+        }
+        if (apply) {
+            fracLength = length;
+            minimumFracLength = minimumLength;
+            decimalSeparatorRequired = true;
+        }
+    }
+
+    private void parseExponent(boolean apply) {
+        int length = 0;
+        loop: while (index < string.length()) {
+            switch (string.charAt(index)) {
+                case '#':
+                case ',':
+                case '.':
+                case 'E':
+                    throw new IllegalArgumentException("Unexpected char at exponent at " + index +
+                            " in " + string);
+                case '0':
+                    ++length;
+                    break;
+                default:
+                    break loop;
+            }
+            ++index;
+        }
+        if (length == 0) {
+            throw new IllegalArgumentException("Pattern does not specify exponent digits at " + index +
+                    " in " + string);
+        }
+        if (apply) {
+            exponentLength = length;
+        }
+    }
+}
diff --git a/teavm-classlib/src/main/java/org/teavm/classlib/java/util/TObservable.java b/teavm-classlib/src/main/java/org/teavm/classlib/java/util/TObservable.java
index dc65d1316..f8af26322 100644
--- a/teavm-classlib/src/main/java/org/teavm/classlib/java/util/TObservable.java
+++ b/teavm-classlib/src/main/java/org/teavm/classlib/java/util/TObservable.java
@@ -20,7 +20,7 @@ package org.teavm.classlib.java.util;
  * @author shannah
  */
 public class TObservable {
-    TList<TObserver> observers = new TArrayList<TObserver>();
+    TList<TObserver> observers = new TArrayList<>();
 
     boolean changed = false;
 
@@ -34,7 +34,7 @@ public class TObservable {
     /**
      * Adds the specified observer to the list of observers. If it is already
      * registered, it is not added a second time.
-     * 
+     *
      * @param observer
      *            the Observer to add.
      */
@@ -58,7 +58,7 @@ public class TObservable {
 
     /**
      * Returns the number of observers registered to this {@code Observable}.
-     * 
+     *
      * @return the number of observers.
      */
     public int countObservers() {
@@ -68,7 +68,7 @@ public class TObservable {
     /**
      * Removes the specified observer from the list of observers. Passing null
      * won't do anything.
-     * 
+     *
      * @param observer
      *            the observer to remove.
      */
@@ -85,7 +85,7 @@ public class TObservable {
 
     /**
      * Returns the changed flag for this {@code Observable}.
-     * 
+     *
      * @return {@code true} when the changed flag for this {@code Observable} is
      *         set, {@code false} otherwise.
      */
@@ -108,11 +108,10 @@ public class TObservable {
      * If {@code hasChanged()} returns {@code true}, calls the {@code update()}
      * method for every Observer in the list of observers using the specified
      * argument. Afterwards calls {@code clearChanged()}.
-     * 
+     *
      * @param data
      *            the argument passed to {@code update()}.
      */
-    @SuppressWarnings("unchecked")
     public void notifyObservers(Object data) {
         int size = 0;
         TObserver[] arrays = null;
diff --git a/teavm-tests/src/test/java/org/teavm/classlib/java/text/DecimalFormatTest.java b/teavm-tests/src/test/java/org/teavm/classlib/java/text/DecimalFormatTest.java
new file mode 100644
index 000000000..6ec6ee754
--- /dev/null
+++ b/teavm-tests/src/test/java/org/teavm/classlib/java/text/DecimalFormatTest.java
@@ -0,0 +1,112 @@
+package org.teavm.classlib.java.text;
+
+import static org.junit.Assert.*;
+import java.text.DecimalFormat;
+import java.text.DecimalFormatSymbols;
+import java.util.Locale;
+import org.junit.Test;
+
+/**
+ *
+ * @author Alexey Andreev
+ */
+public class DecimalFormatTest {
+    @Test
+    public void parsesIntegerPattern() {
+        DecimalFormat format = new DecimalFormat("00");
+        assertEquals(2, format.getMinimumIntegerDigits());
+        assertFalse(format.isDecimalSeparatorAlwaysShown());
+        assertFalse(format.isGroupingUsed());
+        assertEquals(0, format.getGroupingSize());
+        assertEquals(0, format.getMinimumFractionDigits());
+        assertEquals(0, format.getMaximumFractionDigits());
+
+        format = new DecimalFormat("##");
+        assertEquals(0, format.getMinimumIntegerDigits());
+        assertFalse(format.isDecimalSeparatorAlwaysShown());
+        assertFalse(format.isGroupingUsed());
+        assertEquals(0, format.getGroupingSize());
+        assertEquals(0, format.getMinimumFractionDigits());
+        assertEquals(0, format.getMaximumFractionDigits());
+
+        format = new DecimalFormat("#,##0");
+        assertEquals(1, format.getMinimumIntegerDigits());
+        assertFalse(format.isDecimalSeparatorAlwaysShown());
+        assertTrue(format.isGroupingUsed());
+        assertEquals(3, format.getGroupingSize());
+        assertEquals(0, format.getMinimumFractionDigits());
+        assertEquals(0, format.getMaximumFractionDigits());
+    }
+
+    @Test
+    public void selectsLastGrouping() {
+        DecimalFormat format = new DecimalFormat("#,0,000");
+        assertEquals(4, format.getMinimumIntegerDigits());
+        assertTrue(format.isGroupingUsed());
+        assertEquals(3, format.getGroupingSize());
+    }
+
+    @Test
+    public void parsesPrefixAndSuffixInPattern() {
+        DecimalFormat format = new DecimalFormat("(00)", new DecimalFormatSymbols(Locale.ENGLISH));
+        assertEquals(2, format.getMinimumIntegerDigits());
+        assertEquals("(", format.getPositivePrefix());
+        assertEquals(")", format.getPositiveSuffix());
+        assertEquals("-(", format.getNegativePrefix());
+        assertEquals(")", format.getNegativeSuffix());
+
+        format = new DecimalFormat("+(00);-{#}", new DecimalFormatSymbols(Locale.ENGLISH));
+        assertEquals(2, format.getMinimumIntegerDigits());
+        assertEquals("+(", format.getPositivePrefix());
+        assertEquals(")", format.getPositiveSuffix());
+        assertEquals("-{", format.getNegativePrefix());
+    }
+
+    @Test
+    public void parsesFractionalPattern() {
+        DecimalFormat format = new DecimalFormat("#.");
+        assertEquals(1, format.getMinimumIntegerDigits());
+        assertTrue(format.isDecimalSeparatorAlwaysShown());
+        assertFalse(format.isGroupingUsed());
+        assertEquals(0, format.getGroupingSize());
+        assertEquals(0, format.getMinimumFractionDigits());
+        assertEquals(0, format.getMaximumFractionDigits());
+
+        format = new DecimalFormat("#.00");
+        assertEquals(0, format.getMinimumIntegerDigits());
+        assertFalse(format.isGroupingUsed());
+        assertEquals(0, format.getGroupingSize());
+        assertEquals(2, format.getMinimumFractionDigits());
+        assertEquals(2, format.getMaximumFractionDigits());
+
+        format = new DecimalFormat("#.00##");
+        assertEquals(0, format.getMinimumIntegerDigits());
+        assertFalse(format.isGroupingUsed());
+        assertEquals(0, format.getGroupingSize());
+        assertEquals(2, format.getMinimumFractionDigits());
+        assertEquals(4, format.getMaximumFractionDigits());
+
+        format = new DecimalFormat("#00.00##");
+        assertEquals(2, format.getMinimumIntegerDigits());
+        assertFalse(format.isGroupingUsed());
+        assertEquals(0, format.getGroupingSize());
+        assertEquals(2, format.getMinimumFractionDigits());
+        assertEquals(4, format.getMaximumFractionDigits());
+
+        format = new DecimalFormat("#,#00.00##");
+        assertEquals(2, format.getMinimumIntegerDigits());
+        assertTrue(format.isGroupingUsed());
+        assertEquals(3, format.getGroupingSize());
+        assertEquals(2, format.getMinimumFractionDigits());
+        assertEquals(4, format.getMaximumFractionDigits());
+    }
+
+    @Test
+    public void parsesExponentialPattern() {
+        DecimalFormat format = new DecimalFormat("##0E00");
+        assertEquals(1, format.getMinimumIntegerDigits());
+        assertEquals(0, format.getGroupingSize());
+        assertEquals(0, format.getMinimumFractionDigits());
+        assertEquals(0, format.getMaximumFractionDigits());
+    }
+}