4.6 java

        String s1 = "Hello";
        System.out.println(s1 + "字符串的长度为" + s1.length());
        
        String s2 = "heLlo";
        System.out.println(s2.equals(s1) ? "两个字符串内容一致" : "两个字符串内容不一致");
        System.out.println(s2.equalsIgnoreCase(s1) ? "两个字符串内容一致" : "两个字符串内容不一致");
        
        System.out.println(s1 + " World!");
        System.out.println(s1.concat(" World!"));
        
        System.out.println(s1.indexOf("ml"));
        System.out.println(s1.indexOf("llo"));
        
        String fileName = "HelloWorld.java";
        System.out.println(fileName.substring(fileName.indexOf(".") + 1));
        
        String info = "鲁班 男 20 偷蓝";
        String[] infos = info.split(" ");
        System.out.println("姓名:" + infos[0]);
        System.out.println("性别:" + infos[1]);
        System.out.println("年龄:" + infos[2]);
        System.out.println("爱好:" + infos[3]);
        
        
        Scanner input = new Scanner(System.in);
        System.out.println("请输入邮箱：");
        String email = input.next();
        int star = email.indexOf("@");
        int end = email.indexOf(".");
        System.out.println("该邮箱是" + email.substring(star + 1,end) + "邮箱");

        String time = "2002-04-06 13:14:52";
        String[] times = time.split(" ");
        System.out.println("日期:" + times[0]);
        System.out.println("时间:" + times[1]);
        String[] riqi = times[0].split("-");
        System.out.println("年:" + riqi[0]);
        System.out.println("月:" + riqi[1]);
        System.out.println("日:" + riqi[2]);
        String[] shijian = times[1].split(":");
        System.out.println("时:" + shijian[0]);
        System.out.println("分:" + shijian[1]);
        System.out.println("秒:" + shijian[2]);