PrintDaimond program in java

package com.java.exp;

public class Diamond {
public static void main(String[] args)
{
int i, j, k;
for(i=1;i<=5;i++)
{
for(j=i;j<5;j++)
{
System.out.print(" ");
}
for(k=1;k<(i*2);k++)
{
System.out.print("*");
}
System.out.println();
}
for(i=4;i>=1;i--)
{
for(j=5;j>i;j--)
{
System.out.print(" ");
}
for(k=1;k<(i*2);k++)
{
System.out.print("*");
}
System.out.println();
}
}


}

OUTPUT::

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

Difference between throw and throws in java

throw keyword:

• throw keyword used to throw user defined exceptions.(we can throw predefined exception too)
• If we are having our own validations in our code we can use this throw keyword.
• For Ex: BookNotFoundException, InvalidAgeException (user defined).

Program:

1. package com.instanceofjava;
2. public class MyExceptionThrow {
3.  
4.  public static void main(String a[]){
5.  
6.  try{
7.  
8. MyExceptionThrow thr = new MyExceptionThrow();
9. System.out.println("length of INDU is "+thr.getStringSize("INDU"));
10. System.out.println("length of SAIDESH is "+thr.getStringSize("SAIDSH"));
11. System.out.println("length of null string is "+thr.getStringSize(null)); 
12.  
13.  }
14. catch (Exception ex){
15.   System.out.println("Exception message: "+ex.getMessage());  
16.  }
17.  }
18.  
19.  public int getStringSize(String str) throws Exception{
20.  
21.  if(str == null){
22.    throw new Exception("String input is null");  
23.  }
24.  return str.length();
25. }
26.  
27. }

Output
length of INDU is 4
length of SAIDESH is 5
Exception message: String input is null

throws keyword:

•  The functionality of throws keyword is only to explicitly to mention that the method is proven transfer un handled exceptions to the calling place.

Program:

1. package com.instanceofjava;
2. public class ExcpetionDemo {
3.  
4. public static void main(String agrs[]){
5.  
6. try
7. {
8. //statements
9. }
10. catch(Exception e)
11. {
12. System.out.println(e);
13. }
14. finally(){compulsorily executable statements
15. }
16. }
17.  
18. }

Closing All Tabs Using Robot Class In Selenium WebDriver

Closing All Tabs Using Robot Class In Selenium WebDriver

Earlier we have used java robot class to save Image from page In THIS POST. Robot class Is useful to send key-press and key-release events. We will use same thing here to perform keyboard ALT + SPACE + "c" (Shortcut key)  key-press events to close all tabs of browser. We can perform this key-press event sequence very easily using Robot class. I am suggesting you to use always WebDriver's driver.quit(); method to close all tabs of browser. Intention of this postIs to make you more aware about Robot class usage with selenium WebDriver so you can perform such tricky actions 

easily whenever required.

Bellow given example has used Robot class In @AfterTest methodto close browser tabs using ALT + SPACE + 'c' key-press event sequence. Run It In your eclipse IDE to check how It works.

package Testing_Pack;

import java.awt.AWTException;

import java.awt.Robot;

import java.awt.event.KeyEvent;

import java.util.concurrent.TimeUnit;

import org.openqa.selenium.By;

import org.openqa.selenium.Keys;

import org.openqa.selenium.WebDriver;

import org.openqa.selenium.firefox.FirefoxDriver;

import org.testng.annotations.AfterTest;

import org.testng.annotations.BeforeTest;

import org.testng.annotations.Test;

public class Tabs {

 WebDriver driver;

 Robot rb;

 @BeforeTest

 public void setup() throws Exception {

  driver = new FirefoxDriver();

  driver.manage().window().maximize();

  driver.manage().timeouts().implicitlyWait(5, TimeUnit.SECONDS);

  driver.get("http://use any website try ur self");

 }

 @Test

 public void openTab() {  

  driver.findElement(By.cssSelector("body")).sendKeys(Keys.CONTROL +"t");

  driver.get("http:try your own");

  switchToTab();

  driver.findElement(By.xpath("//input[@id='6']")).click();

  driver.findElement(By.xpath("//input[@id='plus']"));

  driver.findElement(By.xpath("//input[@id='3']"));

  driver.findElement(By.xpath("//input[@id='equals']"));

  

  switchToTab();

  driver.findElement(By.xpath("//input[@name='FirstName']")).sendKeys("hi");

  driver.findElement(By.xpath("//input[@name='LastName']")).sendKeys("test");

  

  switchToTab();

  String str = driver.findElement(By.xpath("//input[@id='Resultbox']")).getAttribute("value");

  System.out.println("Sum result Is -> "+str);

 } 

 public void switchToTab() {  

  driver.findElement(By.cssSelector("body")).sendKeys(Keys.CONTROL +"\t");  

  driver.switchTo().defaultContent();  

 }

 @AfterTest

 public void closeTabs() throws AWTException {

  //Used Robot class to perform ALT + SPACE + 'c' keypress event.

  rb =new Robot();

  rb.keyPress(KeyEvent.VK_ALT);

  rb.keyPress(KeyEvent.VK_SPACE);

  rb.keyPress(KeyEvent.VK_C);

 }

}