package com.bwf.str;
//
public class Demo4 {
public static void main(String[] args) {
// String s1 = "ab";
// String s2 = "ab";
// String s3 = "a" + "b";
//
// System.out.println(s1 == s2); // true
// System.out.println(s2 == s3); // true
/*
*
* s1 s2
* s3 ,
* s3 = "ab"
* s1 == s2 == s3
*/
// String s1 = "hello";
// String s2 = new String("hello");
// String s3 = "he" + new String("llo");
//
// System.out.println(s1 == s2); // false
// System.out.println(s1 == s3); // false
/*
* new
* "hello"
* s1 s2 ,
*
* s3 ,
* , s1 != s3
*/
// String a = "sfalse";
// String b = "s" + false;
// System.out.println(a == b);
/*
* "s1" ,
* b = "s"+1 ,
* a == b
*
*/
// String s1 = "ab";
// String s2 = "aab";
// String s3 = "a" + s1;
// System.out.println(s2 == s3);
/*
* s1 s2
* s3 ,
* s2 != s3
*/
// final String s1 = "ab";
// String s2 = "aab";
// String s3 = "a" + s1;
// System.out.println(s2 == s3);
/*
* final s1
*
* s3
*
* s2 s3
*/
// String s1 = "abc";
// String s2 = getAbc();
// System.out.println(s1 == s2); // true
String s1 = "abc";
String s2 = getAbc2();
System.out.println(s1 == s2);
}
private static String getAbc() {
return "abc";
}
private static String getAbc2() {
String s = new String("ab") + "c";
return s;
}
}