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SIntern.java
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32 lines (27 loc) · 981 Bytes
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/**
* @program JavaBooks
* @description: String.Intern
* @author: mf
* @create: 2020/02/12 01:35
*/
package com.strings;
/**
* 使用 String.intern() 可以保证相同内容的字符串变量引用同一的内存对象。
*/
public class SIntern {
public static void main(String[] args) {
// 采用new String创建对象
String s1 = new String("aaa");
String s2 = new String("aaa");
System.out.println(s1 == s2); // false
// 将s1的对象通过intern放到String Pool中
String s3 = s1.intern();
System.out.println(s1.intern() == s3); // true
System.out.println(s1.intern() == s2.intern()); // true
System.out.println(s3 == "aaa"); // true
// 如果是采用 "bbb" 这种使用双引号的形式创建字符串实例，会自动地将新建的对象放入 String Pool 中。
String s4 = "bbb";
String s5 = "bbb";
System.out.println(s4 == s5); // true
}
}