package com.numix.calculator; public class MutableString { private String mText; public MutableString() {} public MutableString(String text) { this.mText = text; } public String getText() { return mText; } public void setText(String text) { this.mText = text; } public int length() { return mText.length(); } public boolean isEmpty() { return mText.isEmpty(); } public String substring(int start) { return mText.substring(start); } public String substring(int start, int end) { return mText.substring(start, end); } public CharSequence subSequence(int start, int end) { return mText.subSequence(start, end); } public boolean startsWith(String prefix) { return mText.startsWith(prefix); } }