intern方法：

当调用intern方法时，如果池已经包含一个等于此String对象的字符串(用equals(Object)方法确定)，则返回池中的字符串。否则，将此String 对象添加到池中，并返回此 String对象的引用
解读：

• b.intern()方法最终返回的是常量池的地址(对象) ```java package test;

public class Main { public static void main(String[] args) { String a = “WTY2002”; //a 指向 常量池的 “WTY2002” String b =new String(“WTY2002”);//b 指向堆中对象 System.out.println(a.equals(b)); //T System.out.println(a==b); //F //b.intern() 方法返回常量池地址 System.out.println(a==b.intern()); //T System.out.println(b==b.intern()); //F } }

![image.png](https://cdn.nlark.com/yuque/0/2021/png/21705001/1639034620141-bf824ef6-40fa-4d14-802a-17b410e59a55.png#clientId=ue98bc489-d3b7-4&crop=0&crop=0&crop=1&crop=1&from=paste&height=252&id=u1e655728&margin=%5Bobject%20Object%5D&name=image.png&originHeight=206&originWidth=609&originalType=binary&ratio=1&rotation=0&showTitle=false&size=17123&status=done&style=none&taskId=ub8f4347a-54ae-4648-aa7d-b212ce39fee&title=&width=744)
```java
package test;
public class Main {
    public static void main(String[] args) {
        String s1 = "WTY2002"; //指向常量池”WTY2002”
        String s2 = "java"; //指向常量池”java”
        String s4 = "java";//指向常量池”java”
        String s3 = new String("java");//指向堆中对象
        System.out.println(s2 == s3); // F
        System.out.println(s2 == s4);  //T
        System.out.println(s2.equals(s3));//T
        System.out.println(s1 == s2);  //F
    }
}

package test;
public class Main {
    public static void main(String[] args) {
        Person p1 = new Person();
        p1.name = "WTY2002";
        Person p2 = new Person();
        p2.name = "WTY2002";
        System.out.println(p1.name.equals(p2.name));//比较内容: True
        System.out.println(p1.name == p2.name);  //T 均指向常量池中地址
        System.out.println(p1.name == "WTY2002");   //T 均指向常量池中地址
        String s1 = new String("bcde");
        String s2 = new String("bcde");
        System.out.println(s1==s2); //False
    }
}
class Person {
    public String name;
}