java中实体类tostring方法怎么用，java中如何用tostring方法

今天突然想到了一个问题：一个对象默认的toString方法，返回的String是放在常量池中的，还是堆中的

就做了个实验

Integer one_1 = new Integer(1);

String str_one = one_1.toString();

String one_2 = “1”;

String one_3 = new String(“1”);

System.out.println(“str_one = “+str_one);

System.out.println(“one_2 = “+one_2);

System.out.println(“one_3 = “+one_3);

System.out.println(“one_1 == one_2 “+(str_one == one_2));

System.out.println(“one_1 == one_3 “+(str_one == one_3));

System.out.println(“str_one.equals(one_3) “+str_one.equals(one_3));

System.out.println(“one_2 == one_3 “+(one_2 == one_3));

输出

str_one = 1

one_2 = 1

one_3 = 1

one_1 == one_2 false

one_1 == one_3 false

str_one.equals(one_3) true

one_2 == one_3 false

香港vps

证明了：对象默认的toString方法，返回的String是放在堆中的String对象