Program 1:-
class Main{
public static void main(String
args[]){
int i,j;
for(i=1;i<=5;i++){
for(j=1;j<=i;j++)
System.out.print("*");
System.out.println("");
}           
}
}
OUTPUT:-
C:\Users\Saty\Desktop\java>javac
1.java
C:\Users\Saty\Desktop\java>java
Main
*
**
***
****
*****
Program 2:- 
class Main{
public static void main(String
args[]){
int i,j;
for(i=1;i<=5;i++){
for(j=1;j<=i;j++)
System.out.print("*");
System.out.println("");
}
for(i=5;i>=1;i--){
for(j=1;j<=i;j++)
System.out.print("*");
System.out.println("");
}           
}
}
OUTPUT:-
C:\Users\Saty\Desktop\java>javac
1.java
C:\Users\Saty\Desktop\java>java
Main
*
**
***
****
*****
*****
****
***
**
*
Program 3:- 
class Main{
public static void main(String
args[]){
int i,j;
for(i=5;i>=1;i--){
for(j=1;j<=i;j++)
System.out.print("*");
System.out.println("");
}
for(i=1;i<=5;i++){
for(j=1;j<=i;j++)
System.out.print("*");
System.out.println("");
}           
}
}
OUTPUT:-
C:\Users\Saty\Desktop\java>javac
1.java
C:\Users\Saty\Desktop\java>java
Main
*****
****
***
**
*
*
**
***
****
*****
Program 4:- 
class Main{
public static void main(String
args[]){
int i,j;
for(i=1;i<=5;i++){
for(j=1;j<=5-i;j++)
System.out.print(" ");
for(j=1;j<=i;j++)
System.out.print("*");
for(j=1;j<i;j++)
System.out.print("*");
System.out.print("\n");
}           
}
}
OUTPUT:- 
C:\Users\Saty\Desktop\java>javac
1.java
C:\Users\Saty\Desktop\java>java
Main
    *
   ***
  *****
 *******
*********
Program 5:- 
class Main{
public static void main(String
args[]){
int i,j;
for(i=1;i<=5;i++){
for(j=1;j<=5-i;j++)
System.out.print(" ");
for(j=1;j<=i;j++)
System.out.print(" "+i);
System.out.println("");
}
}           
}
OUTPUT:-
C:\Users\Saty\Desktop\java>javac
1.java
C:\Users\Saty\Desktop\java>java
Main
     1
    2 2
   3 3 3
  4 4 4 4
 5 5 5 5 5
Program 6:-  
class Main{ 
public static void main(String
args[]){
int i,j;
for(i=1;i<=5;i++){
for(j=1;j<=i;j++)
System.out.print(" "+i);
System.out.println("");
}
}           
}
OUTPUT:-
C:\Users\Saty\Desktop\java>javac
1.java
C:\Users\Saty\Desktop\java>java
Main
 1
 2 2
 3 3 3
 4 4 4 4
 5 5 5 5 5
Program 7:-
class Main{
public static void main(String args[]){
int i,j;
for(i=1;i<=10;i++){
for(j=1;j<=10;j++)
System.out.print("    "+i*j);
System.out.println("");
}
}   
}
OUTPUT:-
C:\Users\Saty\Desktop\java>javac
1.java
C:\Users\Saty\Desktop\java>java Main
    1    
2     3     4    
5     6     7     8  
  9    10
    2     4    
6     8    10   12  
14   16   18   20
    3     6    
9    12   15   18   21  
24   27   30
    4     8    12  
16   20   24   28   32  
36   40
    5    10   15  
20   25   30   35   40  
45   50
    6    12   18  
24   30   36   42   48  
54   60
    7    14   21  
28   35   42   49   56  
63   70
    8    16   24  
32   40   48   56   64  
72   80
    9    18   27  
36   45   54   63   72  
81   90
   10   20   30   40  
50   60   70   80   90  100
Program 8:-  
class Main{
public static void main(String
args[]){
int i,j;
for(i=1;i<=5;i++){
for(j=1;j<=5-i;j++)
System.out.print(" ");
for(j=1;j<=i;j++)
System.out.print(" "+j);
System.out.println("");
}
}           
}
OUTPUT:-
C:\Users\Saty\Desktop\java>javac
1.java
C:\Users\Saty\Desktop\java>java
Main
     1
    1 2
   1 2 3
  1 2 3 4
 1 2 3 4 5
Program 9:-
class Main{
public static void main(String
args[]){
int i,j;
for(i=1;i<=5;i++){
for(j=1;j<=5-i;j++)
System.out.print(" ");
for(j=1;j<=i;j++)
System.out.print(" "+j);
for(j=1;j<=i;j++)
System.out.print(" ");
System.out.println("");
}
}           
}
OUTPUT:-
C:\Users\Saty\Desktop\java>javac
1.java
C:\Users\Saty\Desktop\java>java
Main
     1
    1 2
   1 2 3
  1 2 3 4
 1 2 3 4 5
Program 10:- 
class Main{
public static void main(String
args[]){
int i,j;
for(i=1;i<=5;i++){
for(j=1;j<=i;j++)
System.out.print("
"+(i+j)%2);
System.out.println(" ");
}
}
}
OUTPUT:-
C:\Users\Saty\Desktop\java>javac
1.java
C:\Users\Saty\Desktop\java>java
Main
 0
 1 0
 0 1 0
 1 0 1 0
 0 1 0 1 0
 
Program 11:-   
class Main{
public static void main(String
args[]){
int i,j;
for(i=1;i<=5;i++){
for(j=1;j<=i;j++)
System.out.print("*");
System.out.println(" ");
}
for(i=1;i<=5;i++){
for(j=5;j>=i;j--)
System.out.print("*");
System.out.println(" ");
}
}
}
OUTPUT:-
C:\Users\Saty\Desktop\java>javac 1.java
C:\Users\Saty\Desktop\java>java
Main
*
**
***
****
*****
*****
****
***
**
*
Program 12:- 
class Main{
public static void main(String
args[]){
int i,j;
for(i=1;i<=5;i++){
for(j=i;j<=5;j++)
System.out.print(" "+j);
System.out.println(" ");
}
}
}
OUTPUT:-
C:\Users\Saty\Desktop\java>javac
1.java
C:\Users\Saty\Desktop\java>java
Main
 1 2 3 4 5
 2 3 4 5
 3 4 5
 4 5
 5
 
Program 13:- 
class Main{
public static void main(String
args[]){
int i,j;
for(i=1;i<=5;i++){
for(j=1;j<=5-i;j++)
System.out.print(" ");
for(j=1;j<=i;j++)
System.out.print("*");
for(j=1;j<i;j++)
System.out.print("*");
System.out.println("");
}
for(i=1;i<=5;i++){
for(j=1;j<i;j++)
System.out.print(" ");
for(j=10-i;j>=i;j--)
System.out.print("*");
System.out.println("");
}           
}
}
OUTPUT:-
C:\Users\Saty\Desktop\java>javac
1.java
C:\Users\Saty\Desktop\java>java
Main
    *
   ***
  *****
 *******
*********
*********
 *******
  *****
   ***
    *
Program 14:-   
class Main{
public static void main(String
args[]){
int i,j;
for(i=1;i<=5;i++){
for(j=1;j<=5-i;j++)
System.out.print(" ");
for(j=1;j<=i;j++)
System.out.print("*");
for(j=1;j<i;j++)
System.out.print("*");
System.out.println("");
}
for(i=1;i<=5;i++){
for(j=1;j<i;j++)
System.out.print(" ");
for(j=5;j>=i;j--)
System.out.print("*");
for(j=5;j>i;j--)
System.out.print("*");
System.out.println("");
}           
}
}
   
OUTPUT:-
C:\Users\Saty\Desktop\java>javac
1.java
C:\Users\Saty\Desktop\java>java
Main
    *
   ***
  *****
 *******
*********
*********
 *******
  *****
   ***
    *
Program 15:-
class Main{
public static void main(String args[]){
int i,j;
for(i=1;i<=5;i++){
for(j=1;j<=i;j++)
System.out.print(" "+j);
for(j=i-1;j>=1;j--)
System.out.print(" "+j);
System.out.println(" ");
}
for(i=4;i>=1;i--){
for(j=1;j<=i;j++)
System.out.print(" "+j);
for(j=i-1;j>=1;j--)
System.out.print(" "+j);
System.out.println(" ");
}
}
}
OUTPUT:- 
C:\Users\Saty\Desktop\java>javac
1.java
C:\Users\Saty\Desktop\java>java
Main
 1
 1 2 1
 1 2 3 2 1
 1 2 3 4 3 2 1
 1 2 3 4 5 4 3 2 1
 1 2 3 4 3 2 1
 1 2 3 2 1
 1 2 1
 1
  
Program 16:-
class Main{
public static void main(String args[]){
int i,j;
for(i=1;i<=5;i++){
for(j=1;j<=i;j++)
System.out.print(" ");
for(j=10-i;j>=i;j--)
System.out.print("*");
System.out.println(" ");
}
}
}
OUTPUT:-
C:\Users\Saty\Desktop\java>javac
1.java
C:\Users\Saty\Desktop\java>java
Main
 *********
  *******
   *****
    ***
     *
Program 17:- 
class Main{
public static void main(String args[]){
int i,j,k=1;
for(i=0;i<=5;i++){
for(j=1;j<=5-i;j++)
System.out.print(" ");
for(j=0;j<=i;j++){
if(j==0||i==0)
k=1;
else
k=(k*(i-j+1)/j);
System.out.print(" "+k);
}
System.out.println(" ");
}
}
} 
 OUTPUT:-
C:\Users\Saty\Desktop\java>javac
1.java
C:\Users\Saty\Desktop\java>java
Main
      1
     1 1
    1 2 1
   1 3 3 1
  1 4 6 4 1
 1 5 10 10 5 1
 Program 18:-   
class Main{
public static void main(String args[]){
int i,j,k=1;
for(i=1;i<=4;i++){
for(j=1;j<=i;j++,k++)
System.out.print(" "+k);
System.out.println(" ");
}
}
}
OUTPUT:-
C:\Users\Saty\Desktop\java>javac
1.java
C:\Users\Saty\Desktop\java>java
Main
 1
 2 3
 4 5 6
 7 8 9 10