Calculator in Java with Source Code

by Online Tutorials Library July 14, 2022

Calculator in Java with Source Code

Calculator in Java with Source Code: We can develop calculator in java with the help of AWT/Swing with event handling. Let’s see the code of creating calculator in java.

 /********************************************* Save this file as MyCalculator.java to compile it use javac MyCalculator.java to use the calcuator do this java MyCalculator  **********************************************/ import java.awt.*; import java.awt.event.*; /*********************************************/  public class MyCalculator extends Frame {  public boolean setClear=true; double number, memValue; char op;  String digitButtonText[] = {“7”, “8”, “9”, “4”, “5”, “6”, “1”, “2”, “3”, “0”, “+/-“, “.” }; String operatorButtonText[] = {“/”, “sqrt”, “*”, “%”, “-“, “1/X”, “+”, “=” }; String memoryButtonText[] = {“MC”, “MR”, “MS”, “M+” }; String specialButtonText[] = {“Backspc”, “C”, “CE” };  MyDigitButton digitButton[]=new MyDigitButton[digitButtonText.length]; MyOperatorButton operatorButton[]=new MyOperatorButton[operatorButtonText.length]; MyMemoryButton memoryButton[]=new MyMemoryButton[memoryButtonText.length]; MySpecialButton specialButton[]=new MySpecialButton[specialButtonText.length];  Label displayLabel=new Label(“0″,Label.RIGHT); Label memLabel=new Label(” “,Label.RIGHT);  final int FRAME_WIDTH=325,FRAME_HEIGHT=325; final int HEIGHT=30, WIDTH=30, H_SPACE=10,V_SPACE=10; final int TOPX=30, TOPY=50; /////////////////////////// MyCalculator(String frameText)//constructor { super(frameText);  int tempX=TOPX, y=TOPY; displayLabel.setBounds(tempX,y,240,HEIGHT); displayLabel.setBackground(Color.BLUE); displayLabel.setForeground(Color.WHITE); add(displayLabel);  memLabel.setBounds(TOPX,  TOPY+HEIGHT+ V_SPACE,WIDTH, HEIGHT); add(memLabel);  // set Co-ordinates for Memory Buttons tempX=TOPX; y=TOPY+2*(HEIGHT+V_SPACE); for(int i=0; i0) resText=resText.substring(0,resText.length()-2); return resText; } //////////////////////////////////////// public static void main(String []args) { new MyCalculator(“Calculator – tutoraspire”); } }  /*******************************************/  class MyDigitButton extends Button implements ActionListener { MyCalculator cl;  ////////////////////////////////////////// MyDigitButton(int x,int y, int width,int height,String cap, MyCalculator clc) { super(cap); setBounds(x,y,width,height); this.cl=clc; this.cl.add(this); addActionListener(this); } //////////////////////////////////////////////// static boolean isInString(String s, char ch) { for(int i=0; i();i++)>;>

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