String

        /**
         * 无参数构造
         * */
        String s = new String();

        /**
         * 字符数组构造
         * */

        char chars[] = {'A', 'B', 'C'};
        String s1 = new String(chars);
        System.out.println(s1);

        /**
         * 字节数字构造
         * */
        byte bytes[] = {92, 20, 32};
        String s2 = new String(bytes);
        System.out.println(s2);

        /**字符串判断方法
         * */

        String str1 = "hello";
        String str2 = "hello";
        String str3 = "hello";
        System.out.println(str1.equals(str2));
        System.out.println(str2.equals(str3));
        System.out.println(str1.equals(str3));

        /**判断字符串相等忽略大小写
         * */

        String str4 = "Jack";
        String str5 = "jack";
        System.out.println(str4.equalsIgnoreCase(str5));

        /** 判断地址值
         * */

        String str6 = str1;
        char chars2[] = {'h', 'e', 'l', 'l', '0'};
        String str7 = new String(chars2);

        System.out.println(str1 == str6);
        System.out.println(str7 == str6);

        /**
         * 获取方法
         * */
        System.out.println(str1.length());
        System.out.println(str1.concat(str2));
        System.out.println(str1.charAt(0));
        System.out.println(str1.indexOf('h'));
        System.out.println(str1.substring(1, 3));
        System.out.println(str1.substring(0, str1.length()));

        /**
         * 转化方法
         * */

        char[] chars1 = str1.toCharArray();
        for (int i = 0; i < chars1.length ; i++) {
           System.out.println(chars1[i]);
        }

        byte[] bytes1 = str1.getBytes();
        for (int i = 0; i <bytes.length ; i++) {
            System.out.println(bytes1[i]);
        }

        System.out.println(str1.replace("h", "*"));

        /**
         * 分割方法
         * */
        String str008 = "hello world";
        String[] split = str008.split("");
        for (int i = 0; i < split.length ; i++) {
            System.out.println(split[i]);
        }