纠结了好久

package com.itcast.stringtest2;
public class Demo {
/**
* @param args
*/
public static void main(String[] args) {
String s1 = "abc";
String s2 = "abc";
System.out.println(s1 == s2);//true
System.out.println(s1.equals(s2));//true
String s3 = new String("abc");
String s4 = new String("abc");
System.out.println(s3 == s4);//false
System.out.println(s3.equals(s4));//true
String s5 = "a";
String s6 = "b";
String s7 = "ab";
// String s7 = "a" + "b";
String s8 = s5 + s6;
System.out.println("s7 == s8 : " + (s7 == s8));
System.out.println("(s5 + s6) == s7 :" + ((s5 + s6) == s7));
System.out.println("\"a\" + \"b\" == s7 : " + ("a" + "b" == s7));
System.out.println("\"a\" + s6 == s7 : " + ("a" + s6 == s7));
System.out.println("(s5 + \"b\" == s7 : " + (s5 + "b" == s7));
String s9 = new String("abc");
String s10 = "abc";
System.out.println("s9 == s10 : " + (s9 == s10));
System.out.println("s9.equals(s10) : " + (s9.equals(s10)));
}
}

复制代码

め白衬衫 · め白衬衫

下面是答案哦：
true
true
false
true
s7==s8: false
(s5+s6)==s7: false
"a"+"b"==s7: true
"a"+ s6==s7: false
s5+ "b"==s7: false
s9==s10: false
s9.equals(s10): true

1198914316

没事，慢慢来，加油。

斷灬dian · 斷灬dian

加油。。。。。。。。。。。。。。。

l763631191 · l763631191

嗯嗯纠结嗯呢~~

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纠结了好久

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