Some another basic program which are print the different parttern. Here we use the "for loop" for the same. Students are request to understand how the minimum change of a program can convert into another pattern. At first assume a matrix box and put the items on it. For more pattern see the following page

• Pattern 1
• Pattern 2

import java.util.*;
public class Pat17
{
public static void main(String []args)
{
int n,c,r,s;
Scanner sc=new Scanner(System.in);
System.out.print("Enter Line no : ");

n=sc.nextInt();
for(r=1;r<=n;r++)
{
for(s=1;s<=n-r;s++)
{
System.out.print(" ");
}
for(c=1;c<=2*r-1;c++)
{
System.out.print("*");
}
System.out.println("");
}
}
}

import java.util.*;
public class Pat18
{
public static void main(String []args)
{
int n,c,r,s,p;
Scanner sc=new Scanner(System.in);
System.out.print("Enter Line no : ");
n=sc.nextInt();
for(r=1;r<=n;r++)
{
p=1;
for(s=1;s<=n-r;s++)
{

System.out.print(" ");
}
for(c=1;c<=2*r-1;c++)
{
System.out.print("" + p);
if(c<r)
{
p++;
}
else
{
p--;
}
}
System.out.println("");
}
}
}

import java.util.*;
public class Pat19
{
public static void main(String []args)
{
int n,c,r,s,p;
Scanner sc=new Scanner(System.in);
System.out.print("Enter Line no : ");
n=sc.nextInt();
for(r=1;r<=n;r++)
{
p=r;
for(s=1;s<=n-r;s++)
{
System.out.print(" ");
}
for(c=1;c<=2*r-1;c++)
{
System.out.print("" + p);
if(c<r)
{
p++;
}
else
{
p--;
}
}
System.out.println("");
}
}
}

import java.util.*;
public class Pat20
{
public static void main(String []args)
{
int n,c,r,s,p;
Scanner sc=new Scanner(System.in);
System.out.print("Enter Line no : ");
n=sc.nextInt();

for(r=1;r<=n;r++)
{
p=1;
for(s=1;s<=n-r;s++)
{
System.out.print(" ");
}
for(c=1;c<=2*r-1;c++)
{
System.out.print("" + p);
p=(p==0)?1:0;
}
System.out.println("");
}
}
}

import java.util.*;
public class Pat21
{
public static void main(String []args)
{
int n,c,r,s;
char ch='A';
Scanner sc=new Scanner(System.in);
System.out.print("Enter Line no : ");
n=sc.nextInt();
for(r=1;r<=n;r++)
{
ch='A';
for(s=1;s<=n-r;s++)
{
System.out.print(" ");
}
for(c=1;c<=2*r-1;c++)
{
System.out.print("" + ch);
if(c<r)
{
ch++;
}
else
{
ch--;
}
}
System.out.println("");
}
}
}

import java.util.*;
public class Pat22
{
public static void main(String []args)
{
int n,c,r,s;
Scanner sc=new Scanner(System.in);
System.out.print("Enter Line no : ");
n=sc.nextInt();
for(r=1;r<=n;r++)
{
for(s=1;s<=r-1;s++)
{
System.out.print(" ");
}

for(c=1;c<=2*(n-r)+1;c++)
{
System.out.print("*");
}
System.out.println("");
}
}
}

import java.util.*;
public class Pat23
{
public static void main(String []args)
{
int n,c,r,s,p;
Scanner sc=new Scanner(System.in);
System.out.print("Enter Line no : ");
n=sc.nextInt();
for(r=1;r<=n;r++)
{
p=1;
for(s=1;s<=r-1;s++)
{
System.out.print(" ");
}
for(c=1;c<=2*(n-r)+1;c++)
{
System.out.print(""+p);
if(c<n-r+1)
{
p++;
}
else
{
p--;
}
}
System.out.println("");
}
}
}

import java.util.*;
public class Pat24
{
public static void main(String []args)
{
int n,c,r,s,p;
Scanner sc=new Scanner(System.in);
System.out.print("Enter Line no : ");
n=sc.nextInt();
for(r=1;r<=n;r++)
{
p=n-r+1;
for(s=1;s<=r-1;s++)
{
System.out.print(" ");
}
for(c=1;c<=2*(n-r)+1;c++)
{
System.out.print(""+p);
if(c<n-r+1)
{
p--;
}
else
{
p++;
}
}
System.out.println("");
}
}
}

import java.util.*;
public class Pat25
{
public static void main(String []args)
{
int n,c,r,s,p;
Scanner sc=new Scanner(System.in);
System.out.print("Enter Line no : ");
n=sc.nextInt();
for(r=1;r<=2*n-1;r++)
{
for(s=1;s<=Math.abs(n-r);s++)
{
System.out.print(" ");
}
p=n-Math.abs(n-r);
for(c=1;c<=2*p-1;c++)
{
System.out.print("*");
}
System.out.println("");
}
}
}

import java.util.*;
public class Pat26
{
public static void main(String []args)
{
int n,c,r,s,p,pr;
Scanner sc=new Scanner(System.in);
System.out.print("Enter Line no : ");
n=sc.nextInt();
for(r=1;r<=2*n-1;r++)
{
pr=1;
for(s=1;s<=Math.abs(n-r);s++)
{
System.out.print(" ");
}
p=n-Math.abs(n-r);
for(c=1;c<=2*p-1;c++)
{
System.out.print(""+pr);
if(c<r)
{
pr++;
}
else
{
pr--;
}
}
System.out.println("");
}
}
}

import java.util.*;
public class Pat27
{
public static void main(String []args)
{
int n,c,r,s,p,pr;
Scanner sc=new Scanner(System.in);
System.out.print("Enter Line no : ");
n=sc.nextInt();
for(r=1;r<=2*n-1;r++)
{
pr=1;
if(r==n || r==n+1)
continue;
for(s=1;s<=Math.abs(n-r);s++)
{
System.out.print("*");
}
p=n-Math.abs(n-r);
for(c=1;c<=2*p-1;c++)
{
System.out.print(" ");
}
for(s=1;s<=Math.abs(n-r);s++)
{
System.out.print("*");
}
System.out.println("");
}
}
}