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Thread: for loop in java

  1. #1
    Junior Member
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    Question for loop in java

    Hi,
    I am new here and beginner for java.
    I wrote a simple List program with for loop.

    public class UserDemo {
     
    	List<String> userNameList = new ArrayList<String>();
     
    	public UserDemo (int number, String prefix){
    		for(int i =1; i <= number; i++){
    			addUser(prefix +"."+ i);
    		}
    		System.out.println("User :" +userNameList );
     
    		int size = userNameList.size();
    		[B]for(int i=0; i<size-1; i++ ){
    			for(int j=i; j<size-1; j++){
    				makeFriend(userNameList.get(i),  
                                    userNameList.get(j+1));
    			}
    		}[/B]
    	}
     
    	public void addUser (String username){
    		userNameList.add(username);
    	}
     
    	public void makeFriend (String currentUsername, String  
            previousUsername){
    		System.out.println(currentUsername + " is friend of-> "  
                    +previousUsername);
    	}
     
    	public static void main(String[] args) {
    		UserDemo au = new UserDemo(5,"newjava");
    	}
    }

    After running this code i m getting output in this form

    User :[newjava.1, newjava.2, newjava.3, newjava.4, newjava.5]
    newjava.1 is friend of-> newjava.2
    newjava.1 is friend of-> newjava.3
    newjava.1 is friend of-> newjava.4
    newjava.1 is friend of-> newjava.5
    newjava.2 is friend of-> newjava.3
    newjava.2 is friend of-> newjava.4
    newjava.2 is friend of-> newjava.5
    newjava.3 is friend of-> newjava.4
    newjava.3 is friend of-> newjava.5
    newjava.4 is friend of-> newjava.5


    but i want output in this form

    User :[newjava.1, newjava.2, newjava.3, newjava.4, newjava.5]
    newjava.1 is friend of-> newjava.2
    newjava.1 is friend of-> newjava.3
    newjava.1 is friend of-> newjava.4
    newjava.1 is friend of-> newjava.5

    newjava.2 is friend of-> newjava.1
    newjava.2 is friend of-> newjava.3
    newjava.2 is friend of-> newjava.4
    newjava.2 is friend of-> newjava.5

    newjava.3 is friend of-> newjava.1
    newjava.3 is friend of-> newjava.2
    newjava.3 is friend of-> newjava.4
    newjava.3 is friend of-> newjava.5

    newjava.4 is friend of-> newjava.1
    newjava.4 is friend of-> newjava.2
    newjava.4 is friend of-> newjava.3
    newjava.4 is friend of-> newjava.5

    newjava.5 is friend of-> newjava.1
    newjava.5 is friend of-> newjava.2
    newjava.5 is friend of-> newjava.3
    newjava.5 is friend of-> newjava.4

    Please help me that what to write within for loop, so it will give output
    as mentioned.

    Thanks in advance!


  2. #2
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    Default Re: for loop in java

    Thanks its working now,
    I should use this.

    for(int i=0; i<size; i++ ) {
         for(int j=0; j<size; j++){ 
              if (i!=j)
                    makeFriend(userNameList.get(i), userNameList.get(j));
         }
         System.out.println();
     }

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