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In this post we are going to make an example that demonstrate the use of intent, intent filter and startActivity in android. Create a new android application project in eclipse and name it as IntentDemo . I change the activity name as First_Activity and corresponding layout name as first_layout . Ads by Google Place a button on the first_layout.xm l file as shown bellow. <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".First_Activity" > <Button ...

In this post we are going to see how to create a simple android application that contains two buttons and how to create the response for the button clicks. Create a new android project named ButtonDemo in eclipse. In  the activity_main.xml add two buttons as shown bellow. <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".MainActivity" > <Button android:id="@+id/button2" android:layout_width="fill_parent" android:layout_he...

In this post i explain how to create your first android application. I use the eclipse ide for the development purpose. See this article for the installation and configuration of eclipse for android. Create a new android application project with name HelloWorld. ( Click the image to enlarge. ) Now on the activity_main.xml file add a new TextView as shown bellow. <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".MainActivity" > <TextView android:...

Question : Write a java program that demonstrates the use of arithmetic operators. Answer : In this program we perform basic calculator functions like addition, subtraction, division and multiplication, which clearly shows the using of arithmetic operators in java. 1: import java.io.BufferedReader; 2: import java.io.IOException; 3: import java.io.InputStreamReader; 4: public class CalculatorDemo { 5: public static void main(String args[]) throws IOException 6: { 7: int a,b,c; 8: float s; 9: BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); 10: System.out.println("Enter first number"); 11: a = Integer.parseInt(br.readLine()); 12: b = Integer.parseInt(br.readLine()); 13: c = a + b; 14: System.out.println("Sum :"+c); 15: c = a - b; 16: System.out.println("Difference :"+c); 17: c = a * b; 18: System.out.println("Product ...

Question 2 : Write a java program for read a string from keyboard and display it. Answer : In this program we accept a string from the keyboard and print that string on the output console. 1: import java.io.BufferedReader; 2: import java.io.IOException; 3: import java.io.InputStreamReader; 4: public class ReadStringDemo 5: { 6: public static void main(String args[])throws IOException 7: { 8: BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); 9: String S; 10: System.out.println("Enter any String "); 11: S = br.readLine(); 12: System.out.println("Entered String is : "+S); 13: } 14: } Ads by Google

Question 1 : Write a program in java for print a greeting message . Answer:  This program demonstrate how to write a simple java program print a greeting message on the output console. 1: public class FirstProgram 2: { 3: // Create the main method here 4: public static void main(String args[]) 5: { 6: System.out.println("this is my first program in java"); 7: } 8: } Ads By Google

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