Ladder Pattern in Java

In the previous sections, we have discussed many pattern programs. In this section, we will create Java program to print ladder with n steps.

Using for Loop

The following program prints the ladder with the gap between two side rails being 3 spaces.

LadderPatternExample1.java

import java.util.Scanner;
public class LadderPatternExample1
{
public static void main(String args[]) 
{
Scanner sc=new Scanner(System.in);
System.out.print("Enter the number of steps: "
);
//reads an integer form the user
//n is the number of steps in ladder
int n=sc.nextInt();
for(int i=1;i<=n*3+2;i++)
{
for(int j=1;j<=5;j++)
{
if(i%3==0)
System.out.print("*");
else if(j==1||j==5)
System.out.print("*");
else
System.out.print(" ");
}
//throws cursor to the new line
System.out.println();
}
}
}

Output:

Using Function

LadderPatternExample2.java

public class LadderPatternExample2
{
//function to print the desired ladder Pattern
static void ladder(int n)
{
for (int i = 0; i <= n; i++)
{
//prints the sub-pattern-1
//n+1 time
System.out.println("*   *");
System.out.println("*   *");
if (i < n)
{
//prints the sub-pattern-2 .i.e step of ladder
//n times
System.out.println("*****");
}
}
}
//driver Code
public static void main(String args[])
{
//n is the number of steps
int n = 7;
//function calling
ladder(n);
}
}

Output:

Let's see another ladder pattern that prints ladder of numbers.

Ladder Number Pattern

Let's see the approach to print ladder number pattern.

Approach:

Read or initialize the number of steps and store it in a variable row.
Define a for loop to print the row value and number for each row. Each iteration prints two side numbers.
Define an if statement and check for condition (r< row). If the condition returns true, print stair row.

Let's implement the above steps in a Java program.

LadderPatternExample3.java

import java.util.*;
public class LadderPatternExample3
{    
public static void main(String args[])   
{   
//creating object 
Scanner sc = new Scanner(System.in);
System.out.print("Enter the number of steps: ");
//reads number of steps from the user
int row = sc.nextInt();
//for loop 
for (int i = 0; i <= row; i++)
{
//prints the sub-pattern-1 row+1 time
System.out.println(i+"   "+i);
System.out.println(i+"   "+i);
//prints the sub-pattern-2 row times
if (i < row)
//prints row of stairs
System.out.println(i+""+i+""+i+""+i+i);
}
}
}

Output: