Implements som java.lang.String methods

teavm-classlib/src/main/java/org/teavm/classlib/java/lang/StringTests.java

@@ -164,4 +164,30 @@ public class StringTests {
     public void replacesCharacter() {
         assertEquals("abbdbbd", "abcdbcd".replace('c', 'b'));
     }
+
+    @Test
+    public void containsWorks() {
+        assertTrue("abcd".contains("bc"));
+    }
+
+    @Test
+    public void sequenceReplaced() {
+        assertEquals("ba", "aaa".replace("aa", "b"));
+    }
+
+    @Test
+    public void trimWorks() {
+        assertEquals("ab", "  ab   ".trim());
+        assertEquals("ab", "ab".trim());
+        assertEquals("", "  ".trim());
+    }
+
+    @Test
+    public void convertedToCharArray() {
+        char[] array = "123".toCharArray();
+        assertEquals(3, array.length);
+        assertEquals('1', array[0]);
+        assertEquals('2', array[1]);
+        assertEquals('3', array[2]);
+    }
 }

teavm-classlib/src/main/java/org/teavm/classlib/java/lang/TAbstractStringBuilder.java

@@ -110,6 +110,21 @@ class TAbstractStringBuilder extends TObject implements TSerializable, TCharSequ
         return buffer[index];
     }
 
+    public TAbstractStringBuilder append(TCharSequence s, int start, int end) {
+        if (start > end || end > s.length() || start < 0) {
+            throw new TIndexOutOfBoundsException();
+        }
+        ensureCapacity(end - start);
+        for (int i = start; i < end; ++i) {
+            buffer[length++] = s.charAt(i);
+        }
+        return this;
+    }
+
+    public TAbstractStringBuilder append(TCharSequence s) {
+        return append(s, 0, s.length());
+    }
+
     @Override
     public TCharSequence subSequence(int start, int end) {
         // TODO: implement

teavm-classlib/src/main/java/org/teavm/classlib/java/lang/TString.java

@@ -2,6 +2,7 @@ package org.teavm.classlib.java.lang;
 
 import org.teavm.classlib.java.lang.io.TSerializable;
 import org.teavm.javascript.ni.GeneratedBy;
+import org.teavm.javascript.ni.Rename;
 
 /**
  *
@@ -328,10 +329,68 @@ public class TString extends TObject implements TSerializable, TComparable<TStri
         return new TString(buffer);
     }
 
+    public boolean contains(TCharSequence s) {
+        outer:
+        for (int i = 0; i < length(); ++i) {
+            for (int j = 0; j < s.length(); ++j) {
+                if (charAt(i + j) != s.charAt(j)) {
+                    continue outer;
+                }
+            }
+            return true;
+        }
+        return false;
+    }
+
+    public TString replace(TCharSequence target, TCharSequence replacement) {
+        TStringBuilder sb = new TStringBuilder();
+        int sz = length() - target.length();
+        int i = 0;
+        outer:
+        for (; i < sz; ++i) {
+            for (int j = 0; j < target.length(); ++j) {
+                if (charAt(i + j) != target.charAt(j)) {
+                    sb.append(charAt(i));
+                    continue outer;
+                }
+            }
+            sb.append(replacement);
+            i += target.length() - 1;
+        }
+        sb.append(substring(i));
+        return TString.wrap(sb.toString());
+    }
+
+    public TString trim() {
+        int lower = 0;
+        int upper = length() - 1;
+        while (lower <= upper && charAt(lower) <= ' ') {
+            ++lower;
+        }
+        while (lower <= upper && charAt(upper) <= ' ') {
+            --upper;
+        }
+        return substring(lower, upper + 1);
+    }
+
     public static TString valueOf(int index) {
         return new TStringBuilder().append(index).toString0();
     }
 
+    @Override
+    @Rename("toString")
+    public TString toString0() {
+        return this;
+    }
+
+    public char[] toCharArray() {
+        char[] array = new char[characters.length];
+        for (int i = 0; i < array.length; ++i) {
+            array[i] = characters[i];
+        }
+        return array;
+    }
+
     @Override
     public boolean equals(TObject other) {
         if (this == other) {

teavm-classlib/src/main/java/org/teavm/classlib/java/lang/TStringBuilder.java

@@ -28,4 +28,16 @@ public class TStringBuilder extends TAbstractStringBuilder {
         super.appendCodePoint(codePoint);
         return this;
     }
+
+    @Override
+    public TStringBuilder append(TCharSequence s, int start, int end) {
+        super.append(s, start, end);
+        return this;
+    }
+
+    @Override
+    public TStringBuilder append(TCharSequence s) {
+        super.append(s);
+        return this;
+    }
 }