string字符串转数组

string字符串转数组

public class Arr {

    public static void main(String[] args) {
        // 字符数组转换成string
        char data[] = { 'a', 'b', 'c' };
        String str = new String(data);
        System.out.println(str);
        // String-------字符数组
        String s = "qwertyuiop";
        char[] array = s.toCharArray();
        for (char a : array) {
            System.out.println(a);
        }
        // 字符串-------字节数组
        String s1 = "abcdABCD";
        byte[] b = s1.getBytes();
        for (int i = 0; i < b.length; i++) {
            System.out.print(b[i] + " ");
        }
        // 字节数组----------string
        String s2 = new String(b);
        System.out.println(s2);
    }
}

String 字符串相关操作
 1 /**
 2  * THis_is_a_cat 
 3  * This Is A Cat
 4  * 
 5  * Cat A Is This
 6  * @author Administrator
 7  *
 8  */
 9 public class Test07Str {
10     public static void main(String[] args) {
11         String s="THiS_is_a_cat";
12         //拆分
13         String[] arr =s.split("_");
14         //声明新的字符串
15 //        String sumStr="";
16         String sumStr=new String();
17         //遍历的时候直接累加到sumStr上
18         for(int i=0;i<arr.length;i++){
19 //            System.out.println(arr[i].substring(0, 1).toUpperCase());
20 //            System.out.println(arr[i].substring(1).toLowerCase());
21             sumStr+=arr[i].substring(0, 1).toUpperCase()+arr[i].substring(1).toLowerCase()+" ";
22         }
23         System.out.println("转换后的："+sumStr);
24         
25         System.out.println("-------------------------");
26         //清空一下
27         sumStr="";
28         for(int i=arr.length-1;i>=0;i--){
29             sumStr+=arr[i].substring(0, 1).toUpperCase()+arr[i].substring(1).toLowerCase()+" ";
30         }
31         System.out.println("转换后的："+sumStr);
32     }
33 }