JAVAString与基本类包装类转换与编码方式设置------JAVA

短命女 2024-03-22 13:25 18阅读 0赞

>     import java.io.UnsupportedEncodingException;
>     
>     public class StringMethod
>     {
>         public static void main(String[] args)
>         {
>             test4();
>         }
>     
>         public static void test()
>         {
>             String s1 = new String();
>             String s2 = new String("");
>             String s3 = new String(new char[]{'a','b','c'});
>             System.out.println(s3);
>         }
>     
>         public static void test2()
>         {
>             int num = 10;
>             //方式1
>             String s1 = num + "";
>             //方式2
>             String s2 = String.valueOf(num);
>             //方法3
>             String s3 = "123";
>             int i1 = Integer.parseInt(s3);
>         }
>     
>         public static void test3()
>         {
>             String str = "hello";
>             char[] arr = str.toCharArray();
>             for (int i = 0; i < arr.length; i++)
>             {
>                 System.out.println(arr[i]);
>             }
>             String str1 = new String(arr);
>             System.out.println(str1);
>         }
>     
>         public static void test4()
>         {
>             String str = new String("中国");
>             byte[] arr = null;
>             try
>             {
>                 arr = str.getBytes("utf-8");
>             }
>             catch (UnsupportedEncodingException e)
>             {
>                 throw new RuntimeException(e);
>             }
>             for (int i = 0; i < arr.length; i++)
>             {
>                 System.out.println(arr[i]);
>             }
>             String str1 = new String(arr);
>             System.out.println(str1);
>             try {
>                 arr = str.getBytes("gbk");
>             } catch (UnsupportedEncodingException e) {
>                 throw new RuntimeException(e);
>             }
>             for (int i = 0; i < arr.length; i++)
>             {
>                 System.out.println(arr[i]);
>             }
>             String str2 = new String(arr);
>             System.out.println(str2);
>         }
>     }
> 
> import java.io.UnsupportedEncodingException;
> 
> public class StringMethod  
> \{  
> public static void main(String\[\] args)  
> \{  
> test4();  
> \}
> 
> public static void test()  
> \{  
> String s1 = new String();  
> String s2 = new String("");  
> String s3 = new String(new char\[\]\{'a','b','c'\});  
> System.out.println(s3);  
> \}
> 
> public static void test2()  
> \{  
> int num = 10;  
> //方式1  
> String s1 = num + "";  
> //方式2  
> String s2 = String.valueOf(num);  
> //方法3  
> String s3 = "123";  
> int i1 = Integer.parseInt(s3);  
> \}
> 
> public static void test3()  
> \{  
> String str = "hello";  
> char\[\] arr = str.toCharArray();  
> for (int i = 0; i < arr.length; i++)  
> \{  
> System.out.println(arr\[i\]);  
> \}  
> String str1 = new String(arr);  
> System.out.println(str1);  
> \}
> 
> public static void test4()  
> \{  
> String str = new String("中国");  
> byte\[\] arr = null;  
> try  
> \{  
> arr = str.getBytes("utf-8");  
> \}  
> catch (UnsupportedEncodingException e)  
> \{  
> throw new RuntimeException(e);  
> \}  
> for (int i = 0; i < arr.length; i++)  
> \{  
> System.out.println(arr\[i\]);  
> \}  
> String str1 = new String(arr);  
> System.out.println(str1);  
> try \{  
> arr = str.getBytes("gbk");  
> \} catch (UnsupportedEncodingException e) \{  
> throw new RuntimeException(e);  
> \}  
> for (int i = 0; i < arr.length; i++)  
> \{  
> System.out.println(arr\[i\]);  
> \}  
> String str2 = new String(arr);  
> System.out.println(str2);  
> \}  
> \}