diff --git a/core/src/main/java/org/teavm/classlib/java/text/TStringCharacterIterator.java b/core/src/main/java/org/teavm/classlib/java/text/TStringCharacterIterator.java
new file mode 100644
index 0000000..eb390da
--- /dev/null
+++ b/core/src/main/java/org/teavm/classlib/java/text/TStringCharacterIterator.java
@@ -0,0 +1,166 @@
+package org.teavm.classlib.java.text;
+
+/**
+ * Implementation of {@link TCharacterIterator} to iterate the characters of a String.
+ */
+public final class TStringCharacterIterator implements TCharacterIterator {
+  private String text;
+
+  private int begin;
+
+  private int end;
+
+  private int pos;
+
+  public TStringCharacterIterator(String text) {
+
+    this(text, 0);
+  }
+
+  public TStringCharacterIterator(String text, int pos) {
+
+    this(text, 0, text.length(), pos);
+  }
+
+  public TStringCharacterIterator(String text, int begin, int end, int pos) {
+
+    if (text == null) {
+      throw new NullPointerException();
+    }
+    this.text = text;
+
+    if (begin < 0 || begin > end || end > text.length()) {
+      throw new IllegalArgumentException("Invalid substring range");
+    }
+
+    if (pos < begin || pos > end) {
+      throw new IllegalArgumentException("Invalid position");
+    }
+    this.begin = begin;
+    this.end = end;
+    this.pos = pos;
+  }
+
+  public void setText(String text) {
+
+    if (text == null)
+      throw new NullPointerException();
+    this.text = text;
+    this.begin = 0;
+    this.end = text.length();
+    this.pos = 0;
+  }
+
+  @Override
+  public char first() {
+
+    this.pos = this.begin;
+    return current();
+  }
+
+  @Override
+  public char last() {
+
+    if (this.end != this.begin) {
+      this.pos = this.end - 1;
+    } else {
+      this.pos = this.end;
+    }
+    return current();
+  }
+
+  @Override
+  public char setIndex(int p) {
+
+    if (p < this.begin || p > this.end)
+      throw new IllegalArgumentException("Invalid index");
+    this.pos = p;
+    return current();
+  }
+
+  @Override
+  public char current() {
+
+    if (this.pos >= this.begin && this.pos < this.end) {
+      return this.text.charAt(this.pos);
+    } else {
+      return DONE;
+    }
+  }
+
+  @Override
+  public char next() {
+
+    if (this.pos < this.end - 1) {
+      this.pos++;
+      return this.text.charAt(this.pos);
+    } else {
+      this.pos = this.end;
+      return DONE;
+    }
+  }
+
+  @Override
+  public char previous() {
+
+    if (this.pos > this.begin) {
+      this.pos--;
+      return this.text.charAt(this.pos);
+    } else {
+      return DONE;
+    }
+  }
+
+  @Override
+  public int getBeginIndex() {
+
+    return this.begin;
+  }
+
+  @Override
+  public int getEndIndex() {
+
+    return this.end;
+  }
+
+  @Override
+  public int getIndex() {
+
+    return this.pos;
+  }
+
+  @Override
+  public boolean equals(Object obj) {
+
+    if (this == obj) {
+      return true;
+    } else if (!(obj instanceof TStringCharacterIterator)) {
+      return false;
+    }
+    TStringCharacterIterator other = (TStringCharacterIterator) obj;
+    if (hashCode() != other.hashCode()) {
+      return false;
+    } else if (!this.text.equals(other.text)) {
+      return false;
+    } else if (this.pos != other.pos || this.begin != other.begin || this.end != other.end) {
+      return false;
+    }
+    return true;
+  }
+
+  @Override
+  public int hashCode() {
+
+    return this.text.hashCode() ^ this.pos ^ this.begin ^ this.end;
+  }
+
+  @Override
+  public Object clone() {
+
+    try {
+      return super.clone();
+    } catch (CloneNotSupportedException e) {
+      throw new InternalError(e);
+    }
+  }
+}