JAVA×Ö·û´®²Ù×÷

1¡¢   public class HelloWorld {
    public static void main(String args[]){
     String s="daxiong";
     System.out.println("Hello,World!"+"lu shenglong"+s);
     char c[]={'s','w','q'};
     String u=new String(c);
     System.out.println(u);
     char ch;
     ch=u.charAt(1);                //×Ö·û½ØÈ¡º¯Êý   
     System.out.println(ch);
     char cha[]=new char[3];
     cha=u.toCharArray();
     for(int i=0;i<3;i++)
      System.out.print(cha[i]+"¡¢");
   
    }
    }
 Êä³ö£º
Hello,World!lu shenglongdaxiong
swq
w
s¡¢w¡¢q¡¢
2¡¢JAVAÖГ==”±È½ÏµÄÊǶÔÏóµÄµØÖ·£¬¶øequals()·½·¨±È½ÏµÄÊǶÔÏóµÄÖµ¡£
3¡¢ÐÞ¸Ä×Ö·û´® String e="windows".replace('w','q');     Êä³ö£ºqindoqs
4¡¢trim()·½·¨£º¸Ã·½·¨·µ»ØÒ»¸öµ÷ÓÃ×Ö·û´®µÄ¿½±´£¬½«Î»ÓÚ×Ö·û´®Ç°ÃæºÍºóÃæµÄ¿Õ°××Ö·ûɾȥ£¬Ò»°ãÐÎʽÈçÏ£ºString s="  hello world  ".trim();
Êä³ö½á¹ûΪ£ºhello world
Ó¦ÓÃʵÀý;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class Test {
   public static void main(String args[]) throws IOException{
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 String str;
 System.out.println("Enter'stop'to quit;");
 System.out.println("Enter Name:");
 do{
  str=br.readLine();
  str=str.trim();
  if(str.equals("Tom"))
   System.out.println("Tom is 10 years old.");
  
 }while(!str.equals("stop"));
 
   }
}
Êä³ö£ºEnter'stop'to quit;
Enter Name:
Tom
Tom i