JAVAString相关API测试------JAVA-蒲公英云

JAVAString相关API测试------JAVA

我就是我 2024-03-22 03:34 173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);
}
}