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public static void main(String[] args) {        Integer i1 = new Integer(1);        Integer i2 = new Integer(1);        // i1,i2分别位于堆中不同的内存空间        System.out.println("i1 == i2:" + (i1 == i2));// 输出false        String s1 = "china";        String s2 = "china";        String ss1 = new String("china");        String ss2 = new String("china");        System.out.println("s1 == s2:" + (s1 == s2));        System.out.println("ss1 == ss2" + (ss1 == ss2));        System.out.println("s1 == ss2" + (s1 == ss2));        // 利用Java反射机制改变string的值        Field f = null;        Field f1 = null;        try {            f = s1.getClass().getDeclaredField("value");            f1 = ss1.getClass().getDeclaredField("value");        } catch (NoSuchFieldException e) {            e.printStackTrace();        }        f.setAccessible(true);        f1.setAccessible(true);        try {            f.set(s1, new char[] { 'c', 'h', 'i', 'n', 'b' });            f1.set(ss1, new char[] { 'c', 'h', 'i', 'n', 'b' });        } catch (Exception e) {            e.printStackTrace();        }        System.out.println("改变后的s1的值：" + s1);        System.out.println("s2的值是：" + s2);        System.out.println("ss1的值是：" + ss1);        System.out.println("s1 == s2:" + (s1 == s2));        System.out.println("ss1 == ss2" + (ss1 == ss2));        System.out.println("s1 == ss2" + (s1 == ss2));        System.out.println("============分割线==================");        System.out.println("改变后的ss1的值：" + ss1);        System.out.println("ss2的值是：" + ss2);    }

 

 

打印的结果：

i1 == i2:false

s1 == s2:true ss1 == ss2false s1 == ss2false 改变后的s1的值：chinb s2的值是：chinb ss1的值是：chinb s1 == s2:true ss1 == ss2false s1 == ss2false ============分割线================== 改变后的ss1的值：chinb ss2的值是：china

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