String方法

时间：2023-01-07 13:16:09

判断是否相等：

        String a = "令狐冲";

        String b = "令狐";

        String c = "冲";

        String d = new String("令狐冲");

        String e = b + c;

        System.out.println(a == (b + c));

        System.out.println(a == d);

        System.out.println(e == (b + c));

        d.intern();

        System.out.println(a == d);

        d = d.intern();

        System.out.println(a == d);

String方法

String 大小写转换：

String str = "ABC";
String str1 = "abc";

System.out.println("ABC大写转小写: " + str.toLowerCase());
System.out.println("abc小写转大写: " + str1.toUpperCase());

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