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public class ClassA {{
private final String stringObject = "A new String";
private String nonConstantString = "Changing String";

public void method(){
String localString = "append";
nonConstantString += localString;
}
}

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public class ClassA {{
private final String stringObject = "A new String";
private StringBuffer nonConstantString = new StringBuffer("Changing String");

public void method(){
String localString = "append";
nonConstantString.append(localString);
}
}