Kaviya.kfor loop:
When you know exactly how many times you want to loop through a block of code, use the for loop instead of a while loop.
Syntax:
for (statement 1; statement 2; statement 3) {
// code block to be executed
}
Statement 1 is executed (one time) before the execution of the code block.
Statement 2 defines the condition for executing the code block.
Statement 3 is executed (every time) after the code block has been executed.
Example:
public class Main {
public static void main(String[] args) {
for (int i = 0; i < 5; i++) {
System.out.println(i);
}
}
}
output:
0
1
2
3
4
shape pattern:
package B1;
public class Shape {
public static void main(String[] args) {
//shape1();
//shape2();
//shape3();
//shape4();
//shape5();
//shape6();
//shape7();
}
private static void shape7() {
for (int row = 1; row <= 9; row++) {
for (int col = 1; col <= 9; col++) {
if(row+col==10||row==col)
System.out.print("* ");
else if(row==1||col==1||row==9)
System.out.print("* ");
else
System.out.print(" ");
}
System.out.println();
}
}
output:
* * * * * * * * *
* * *
* * *
* * *
* *
* * *
* * *
* * *
* * * * * * * * *
private static void shape6() {
for (int row = 1; row <= 9; row++) {
for (int col = 1; col <= 9; col++) {
if(row+col==10||row==col)
System.out.print("* ");
else if(row==1||col==9||row==9)
System.out.print("* ");
else
System.out.print(" ");
}
System.out.println();
}
}
output:
* * * * * * * * *
* * *
* * *
* * *
* *
* * *
* * *
* * *
* * * * * * * * *
private static void shape5() {
for (int row = 1; row <= 9; row++) {
for (int col = 1; col <= 9; col++) {
if(row+col==10||row==col)
System.out.print("* ");
else if(col==1||col==9||row==1)
System.out.print("* ");
else
System.out.print(" ");
}
System.out.println();
}
}
output:
* *
* * * *
* * * *
* * * *
* * *
* * * *
* * * *
* * * *
* * * * * * * * *
private static void shape4() {
for (int row = 1; row <= 9; row++) {
for (int col = 1; col <= 9; col++) {
if(row+col==10||row==col)
System.out.print("* ");
else if(col==1||col==9||row==9)
System.out.print("* ");
else
System.out.print(" ");
}
System.out.println();
}
}
output:
* *
* * * *
* * * *
* * * *
* * *
* * * *
* * * *
* * * *
* * * * * * * * *
private static void shape3() {
for (int row = 1; row <= 9; row++) {
for (int col = 1; col <= 9; col++) {
if(row+col==10||row==col)
System.out.print("* ");
else if(col==1||col==9)
System.out.print("* ");
else
System.out.print(" ");
}
System.out.println();
}
}
output:
* *
* * * *
* * * *
* * * *
* * *
* * * *
* * * *
* * * *
* *
private static void shape2() {
for (int row = 1; row <= 9; row++) {
for (int col = 1; col <= 9; col++) {
if(row==1||row==9||row==col)
System.out.print("* ");
else if(row+col==10||col==1||col==9)
System.out.print("* ");
else
System.out.print(" ");
}
System.out.println();
}
}
output:
* * * * * * * * *
* * * *
* * * *
* * * *
* * *
* * * *
* * * *
* * * *
* * * * * * * * *
private static void shape1() {
for (int row = 1; row <= 9; row++) {
for (int col = 1; col <= 9; col++) {
if(row==1||row==9||row==col)
System.out.print("* ");
else if(row+col==10)
System.out.print("* ");
else
System.out.print(" ");
}
System.out.println();
}
}
}
output:
* * * * * * * * *
* *
* *
* *
*
* *
* *
* *
* * * * * * * * *
Letters pattern:
package B1;
public class Spattern2 {
public static void main(String[] args) {
//patternE();
//patternI();
//patternL();
//patternF();
//patternH();
//patternM();(TBD)
//patternK();
}
private static void patternK() {
for(int row = 1; row<=9; row++)
{
for(int col=1; col<=9; col++) {
if(row+col==6|| col==1)
System.out.print("* ");
else if(col==row-4)
System.out.print("* ");
else
System.out.print(" ");
}
System.out.println();
}
}
output:
* *
* *
* *
* *
*
* *
* *
* *
* *
private static void patternM() {
for(int row = 1; row<=9; row++)
{
for(int col=1; col<=9; col++) {
if(col==1||col==9-1)
System.out.print("* ");
else if(row==col&&col<=9/2||row+col==9-1&&col>=9/2)
System.out.print("* ");
else
System.out.print(" ");
}
System.out.println();
}
}
output:
* * *
* * * *
* * * *
* * *
* *
* *
* *
* *
* *
private static void patternH() {
for(int row = 1; row<=9; row++)
{
for(int col=1; col<=9; col++) {
if(col==9|| row==5||col==1)
System.out.print("* ");
else
System.out.print(" ");
}
System.out.println();
}
}
output:
* *
* *
* *
* *
* * * * * * * * *
* *
* *
* *
* *
private static void patternF() {
for(int row = 1; row<=9; row++)
{
for(int col=1; col<=9; col++) {
if(row==1|| row==5||col==1)
System.out.print("* ");
else
System.out.print(" ");
}
System.out.println();
}
}
output:
* * * * * * * * *
*
*
*
* * * * * * * * *
*
*
*
*
private static void patternL() {
for(int row = 1; row<=9; row++)
{
for(int col=1; col<=9; col++) {
if(row==9||col==1)
System.out.print("* ");
else
System.out.print(" ");
}
System.out.println();
}
}
output:
*
*
*
*
*
*
*
*
* * * * * * * * *
private static void patternI() {
for(int row = 1; row<=9; row++)
{
for(int col=1; col<=9; col++) {
if(row==1||row==9||col==5)
System.out.print("* ");
else
System.out.print(" ");
}
System.out.println();
}
}
output:
* * * * * * * * *
*
*
*
*
*
*
*
* * * * * * * * *
private static void patternE() {
for(int row = 1; row<=9; row++)
{
for(int col=1; col<=9; col++) {
if(row==1||row==9||col==1)
System.out.print("* ");
else if(row==5)
System.out.print("* ");
else
System.out.print(" ");
}
System.out.println();
}
}
}
output:
* * * * * * * * *
*
*
*
* * * * * * * * *
*
*
*
* * * * * * * * *
