JAVAString相关API测试------JAVA

我就是我 2024-03-22 03:34 78阅读 0赞

>     public class StringTest
>     {
>         public static void main(String[] args)
>         {
>     //        test();
>     //        test2();
>     //        test3();
>     //        test4();
>             test5();
>         }
>         public static void test()
>         {
>             String s1 = "Hello";
>             String s2 = "Hello";
>             System.out.println(s1 == s2);
>             s2 = "hi";
>             System.out.println(s1);
>         }
>     
>         public static void test2()
>         {
>             String s1 = "Hello";
>             String s2 = "Hello";
>             s2 += "world";
>             System.out.println(s1);
>         }
>     
>         public static void test3()
>         {
>             String s1 = "Hello";
>             String s2 = "World";
>             String s3 = "HelloWorld";
>             String s4 = "Hello" + "World";
>             String s5 = s1 + "World";
>             String s6 = "Hello" + s2;
>             String s7 = s1 + s2;
>             System.out.println(s3 == s4);
>             System.out.println(s3 == s5);
>             System.out.println(s3 == s6);
>             System.out.println(s3 == s7);
>             System.out.println(s5 == s6);
>             System.out.println(s5 == s7);
>             System.out.println();
>             String s8 = s5.intern();
>             System.out.println(s3 == s8);
>         }
>         public static void test4()
>         {
>             final String s1 = "Hello";
>             final String s2 = "World";
>             String s3 = "HelloWorld";
>             String s4 = "Hello" + "World";
>             String s5 = s1 + "World";
>             String s6 = "Hello" + s2;
>             String s7 = s1 + s2;
>             System.out.println(s3 == s5);
>             System.out.println(s3 == s6);
>             System.out.println(s3 == s7);
>         }
>     
>         public static void test5()
>         {
>             String s1 = "Hello";
>             String s2 = "World";
>             String s3 = "HelloWorld";
>             String s4 = s1.concat(s2);
>             String s5 = "Hello".concat("World");
>             System.out.println(s3 == s4);
>             System.out.println(s3 == s5);
>         }
>     }
> 
> public class StringTest  
> \{  
> public static void main(String\[\] args)  
> \{  
> // test();  
> // test2();  
> // test3();  
> // test4();  
> test5();  
> \}  
> public static void test()  
> \{  
> String s1 = "Hello";  
> String s2 = "Hello";  
> System.out.println(s1 == s2);  
> s2 = "hi";  
> System.out.println(s1);  
> \}
> 
> public static void test2()  
> \{  
> String s1 = "Hello";  
> String s2 = "Hello";  
> s2 += "world";  
> System.out.println(s1);  
> \}
> 
> public static void test3()  
> \{  
> String s1 = "Hello";  
> String s2 = "World";  
> String s3 = "HelloWorld";  
> String s4 = "Hello" + "World";  
> String s5 = s1 + "World";  
> String s6 = "Hello" + s2;  
> String s7 = s1 + s2;  
> System.out.println(s3 == s4);  
> System.out.println(s3 == s5);  
> System.out.println(s3 == s6);  
> System.out.println(s3 == s7);  
> System.out.println(s5 == s6);  
> System.out.println(s5 == s7);  
> System.out.println();  
> String s8 = s5.intern();  
> System.out.println(s3 == s8);  
> \}  
> public static void test4()  
> \{  
> final String s1 = "Hello";  
> final String s2 = "World";  
> String s3 = "HelloWorld";  
> String s4 = "Hello" + "World";  
> String s5 = s1 + "World";  
> String s6 = "Hello" + s2;  
> String s7 = s1 + s2;  
> System.out.println(s3 == s5);  
> System.out.println(s3 == s6);  
> System.out.println(s3 == s7);  
> \}
> 
> public static void test5()  
> \{  
> String s1 = "Hello";  
> String s2 = "World";  
> String s3 = "HelloWorld";  
> String s4 = s1.concat(s2);  
> String s5 = "Hello".concat("World");  
> System.out.println(s3 == s4);  
> System.out.println(s3 == s5);  
> \}  
> \}