diff --git a/classlib/src/main/java/org/teavm/classlib/java/lang/TString.java b/classlib/src/main/java/org/teavm/classlib/java/lang/TString.java
index cfe1d6d7b..06c465e34 100644
--- a/classlib/src/main/java/org/teavm/classlib/java/lang/TString.java
+++ b/classlib/src/main/java/org/teavm/classlib/java/lang/TString.java
@@ -146,6 +146,16 @@ public class TString extends TObject implements TSerializable, TComparable<TStri
     public boolean isEmpty() {
         return characters.length == 0;
     }
+    
+    public boolean isBlank() {
+        
+        for (int i = 0; i < characters.length; i++) {
+            if (characters[i] != ' ') {
+                return false;
+            }
+        }
+        return true;
+    }
 
     public void getChars(int srcBegin, int srcEnd, char[] dst, int dstBegin) {
         if (srcBegin < 0 || srcBegin > srcEnd || srcEnd > length() || dstBegin < 0
diff --git a/tests/src/test/java/org/teavm/classlib/java/lang/StringTest.java b/tests/src/test/java/org/teavm/classlib/java/lang/StringTest.java
index 30ab6049a..8a12ea7a2 100644
--- a/tests/src/test/java/org/teavm/classlib/java/lang/StringTest.java
+++ b/tests/src/test/java/org/teavm/classlib/java/lang/StringTest.java
@@ -17,6 +17,7 @@ package org.teavm.classlib.java.lang;
 
 import static org.junit.Assert.assertArrayEquals;
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertNotEquals;
 import static org.junit.Assert.assertSame;
 import static org.junit.Assert.assertTrue;
@@ -311,4 +312,12 @@ public class StringTest {
         assertEquals(0, str.length());
         assertEquals("", str);
     }
+    
+    @Test
+    public void testIsBlank() {
+        assertTrue(new String(new char[0]).isBlank());
+        assertTrue(new String(new char[] { ' ', ' ' }).isBlank());
+        assertFalse(new String(new char[] { ' ', 'x', ' ' }).isBlank());
+        assertFalse(new String(new char[] { 'a', ' ' }).isBlank());
+    }    
 }