常量池和堆的区别

public class StringTest02 {

public static void main(String[] args) {
//在字符串常量池
String s1 = "hello";
String s2 = "hello";

 String s=aaa"+"bbb"+"ccc"常量池

//因为使用了字符串常量池
System.out.println(s1 == s2);
System.out.println(s1.equals(s2));
System.out.println(s);//常量池
//不建议使用这种方式，浪费内存,在堆里
String s3 = new String("world");
String s4 = new String("world");
//因为使用了new关键字，会在堆里面分别创建两个对象
System.out.println(s3 == s4);//false
System.out.println(s3.equals(s4));//true


String s5 = "aaa";
String s6 = "bbb";
//不会放入字符串常量池
String s7 = s5 + s6;
String s8 = "aaabbb";
String s9 = "aaa" + "bbb";
System.out.println(s7 == s8);//false
System.out.println(s8 == s9);//true

String s10 = "he" + new String("llo");
String s11 = "hello";
System.out.println(s10 == s11);//false
}

}