String类的转换功能（方法）

左手的ㄟ右手 2022-07-14 01:15 151阅读 0赞

package cn.lgt.stringmethods;
    
    public class StringShiftMethods {
        public static void stringShiftMethods(){
            //String类的转换功能
            //1. 把字符串转换为字节数组
            //byte[] getBytes();
            String s1 = "abcde";
            byte[] byt = s1.getBytes();
            for(int i = 0; i < byt.length; i++){
                System.out.print(byt[i] + "  ");
            }
            System.out.println();
            //2. 把字符串转换为字符数组
            //char[] toCharArray();
            char[] chr = s1.toCharArray();
            for(int i = 0; i <chr.length; i++){
                System.out.print(chr[i] + "  ");
            }
            System.out.println();
            //3. 把字符数组转换为字符串
            //static String valueOf(char[] chs);
            char[] chs = {
       'h','e','l','l','o'};
            //静态方法，以静态方式调用
            String s2= String.valueOf(chs);
            System.out.println(s2);
            //4. 把字符串转换为小写
            //String toLowerCase();
            String s3 = "HELLOJAVA";
            String s4 = s3.toLowerCase();
            System.out.println("s3 = " + s3);
            System.out.println("s4 = " + s4);
            //5. 把字符串转换为大写
            String s5 = "helloWorld";
            String s6 = s5.toUpperCase();
            System.out.println("s5 = " + s5);
            System.out.println("s6 = " + s6);
            //6. 把字符串拼接在一起
            //String concat(String str);
            String s7 = "hello";
            String s8 = "java";
            String s9 = s7.concat(s8);
            System.out.println(s9);
            System.out.println(s9.concat(s9));
        }
    }