String是final类，常规情况下其值是不可变的。但是可以通过非常规方法——反射进行修改

/** 通过反射的方式来修改字符串String类的值 * Created by liaoqianwen on 2016/7/8. */public class StringReflectTest {    public static void main(String[] args) throws NoSuchFieldException, IllegalAccessException {        String name = "angel";        String name1 = "angel";        Field strField = String.class.getDeclaredField("value");        strField.setAccessible(true);        char[] data = (char[])strField.get(name);        data[4] = 'r';        System.out.println(name);        System.out.println(name1);        System.out.println(name == name1);    }}