java

gui calculator design /* // Program for a calculator// import java.awt.*; import java.awt.event.*; import javax.swing.*; class Calculator extends JFrame implements ActionListener {     JTextField txt;     JButton btn1,btn2,btn3,btn4,btn5,btn6,btn7,btn8,btn9,btn10,btn11,btn12,btn13,btn14,btn15,btn16,btn17,btn18,btn19;          String s1="",s2="",s3="",s4="",s5="";       double n1=0;       int t=0; int d=0;     Calculator()     {             txt=new JTextField(20);             btn1=new JButton("1");             btn2=new JButton("2");       btn3=new JButton("3");       btn4=new JButton("4");       btn5=new JButton("5");       bt...

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/**Taking input using BufferedReader class in java*/ //Sum.java //note:Remove the double backslash before import and both int statements before compilation //import java.io.*; public class Sum {      public static void main(String [] args)throws IOException      {           BufferedReader br = new BufferedReader(new InputStreamReader(System.in));           // int a = Integer.parseInt(br.readLine());           // int b = Integer.parseInt(br.readLine());            System.out.println("Sum of" +a+"and" +b+ "="+(a+b) );          } } 

//Sum.java /** Find the sum of two numbers taking input using Scanner class */ //note: remove the double back slash before import package before compilation //import java.util.Scannner; public class Sum {     public static void main(String [] args)     {           Scanner input  = new Scanner(System.in);           int a = input.nextInt();           int b = input.nextInt();           System.out.println(" sum of "+a+ "and"+b+" = "+(a+b));     } } /* note: if you want to take input in double or float just     use float a = input.nextfloat(); or         double a = input.nextDouble(); */ 

//Sum.java /** To find the sum of two given numbers in java code */ public class Sum {     public static void main(String [] args)     {              int a =7;                    int b =5;          System.out.println("sum of "+a+"and"+b+"="+(a+b));     } } 

//HelloWorld.java /** Write a program to print ! Hello World in your console in java*/ public class HelloWorld {        public static void main(String [] args)        {             System.out.println("! Hello World");        } }