Java code to display patterns using do while loop

Java code to display patterns using do while loop

In this tutorial, we will discuss the concept of Java code to display patterns using do while loop.

In Java, we can use for loop, while loop, do-while loop to display various number, star, alphabet and binary number patterns

In this topic, we demonstrate how to display print some number and star patterns using the nested do-while loop in Java language.

Program 1

Rectangle number pattern

class DoWhilepattern1{
public static void main(String args[]){
int i=0;
do{
int j=1;
while(j<=6)
{
System.out.print(j);
j++;
}
System.out.println();
i++;

}
while(i<=6);
}
}

When the above code is compiled and executed, it produces the following results

123456
123456
123456
123456
123456
123456

Triangle number pattern

Program 2

class NestedDoWhile1{
public static void main(String args[]){
int row=1,column=1;
int x;
do{
x=6;
do{
System.out.print("");
x--;
}while(x>=row);
column=1;
do{
System.out.print(column+" ");
column++;

}while(column<=row);
System.out.println(" ");
row++;
}while (row<=6);
}

}

When the above code is compiled and executed, it produces the following results

1
1 2
1 2 3
1 2 3 4
1 2 3 4 5
1 2 3 4 5 6

Rectangle star pattern

Program 3

class DoWhilepattern1{
public static void main(String args[]){
int i=0;
do{
int j=1;
while(j<=8)
{
System.out.print("*");
j++;
}
System.out.println();
i++;

}
while(i<=6);
}
}

When the above code is compiled and executed, it produces the following results

********
********
********
********
********
********
********

Triangle star pattern

Program4

class NestedDoWhile{
public static void main(String args[]){
int row=1,column=1;
int x;
do{
x=4;
do{
System.out.print("");
x--;
}while(x>=row);
column=1;
do{
System.out.print("*"+" ");
column++;

}while(column<=row);
System.out.println(" ");
row++;
}while (row<=5);
}

}

When the above code is compiled and executed, it produces the following results

*
**
***
****
*****

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