[Java] StringTokenizer()、split()、substring()

StringTokenizer()分割

Code1:
public static void main(String[] args)
{
StringTokenizer st = new StringTokenizer("www google com"); //預設以" \t\n\r\f"為分隔符號
 while(st.hasMoreTokens())
 {
  System.out.println("Token : " + st.nextToken());
 }
}

輸出：
Token : WWW
Token : google
Token : com

Code2:
public static void main(String[] args)
{
 StringTokenizer st = new StringTokenizer("www.google.com","."); //指定用"."來分割
 while(st.hasMoreElements())
 {
  System.out.println("Token : " + st.nextToken());
 }
}

輸出：
Token : WWW
Token : google
Token : com

split() 分割 

String line = "A, B, C, D,1,2,3";
String[] AfterString = line.split(","); //指定用","來分割
for (int i = 0; i < AfterString.length; i++)
{
System.out.println(AfterString [i]);
}

輸出：
A
 B
 C
 D
1
2
3

substring() 擷取 

String line = "ABCDDCBA ";
String newline1 = line.substring (4);
System.out.println(newline1);
String newline2 = line.substring (0,4);
System.out.println(newline2);

輸出：
DCBA
ABCD

By Hao★