Creating Number Patterns In Java

Creating number or symbol patterns is used to check command of a programmer or a student on for loop. In short its done just for practicing for loop.


Here are some common number patterns :

Pattern 1. 

To Print this pattern use the following code:

public class numPtr {
    public static void main( String arg[]){
        for(int i=1;i<=5;i++){

            for(int j=1;j<=i;j++){
                System.out.print(j);
            }
            System.out.println();
        }
    }
}

Pattern 2. 

To Print this pattern use the following code:

public class numPtr {
    public static void main( String arg[]){
            for(int i=1;i<=5;i++){
            for(int j=5;j>=i;j--){
                System.out.print(j);
            }
            System.out.println();
        }
    }
}

Pattern 3. 

To Print this pattern use the following code:

public class numPtr {
    public static void main( String arg[]){
           for(int i=1,r=5;i<=5;i++,r--){
            for(int j=1;j<=r;j++){
                System.out.print(j);
            }
            System.out.println();        }
    }
}

Pattern 4. 

To Print this pattern use the following code:

public class numPtr {
    public static void main( String arg[]){
int ck=0,c=2;
        while(c>0){
        if(ck==0){
            for(int i=1;i<=5;i++){
            for(int j=1;j<=i;j++){
                System.out.print(j);
            }
            System.out.println();         }
            ck++;
       } else{
            for(int i=1,r=5-1;i<=5-1;i++,r--){
            for(int j=1;j<=r;j++){
                System.out.print(j);            }
            System.out.println();
        }
        }
        c--;
      }

    }
}

Pattern 5. 

To Print this pattern use the following code:

public class numPtr {
    public static void main( String arg[]){
int ck=0,c=2;
        while(c>0){
        if(ck==0){
            for(int i=1,r=5;i<=5;i++,r--){
            for(int j=1;j<=r;j++){
                System.out.print(j);
            }
            System.out.println();        }
            ck++;
       } else{
            for(int i=2;i<=5;i++){
            for(int j=1;j<=i;j++){
                System.out.print(j);            }
            System.out.println();
        }
        }
        c--;
      }

    }
}

Author Note: All the above examples gives output till 5, you can change it accordingly by changing the conditions.