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简单的java程序通过对话框输出 计算加减乘除运算（运算方法可选择）
import javax.swing.JOptionPane; // import class JOptionPanepublic class Addition { public static void main( String args[] ) { String firstNumber, // first string entered by user secondNumber; // second string entered by user int number1, // first number to add number2, // second number to add sum, // sum of number1 and number2 mul ,sub,div; // read in first number from user as a string firstNumber = JOptionPane.showInputDialog( "Enter first integer" ); // read in second number from user as a string secondNumber = JOptionPane.showInputDialog( "Enter second integer" ); // convert numbers from type String to type int number1 = Integer.parseInt( firstNumber ); number2 = Integer.parseInt( secondNumber ); // add the numbers sum = number1 + number2; mul = number1*number2; sub = number1-number2; div = number1/number2; String a; a=JOptionPane.showInputDialog("please choose formula mode sum sub mul div"); // display the results if(a.equals("+")) JOptionPane.showMessageDialog( null, "The sum is " + sum, "Results", JOptionPane.PLAIN_MESSAGE ); if(a.equals("-")) JOptionPane.showMessageDialog( null, "The sum is " + sub, "Results", JOptionPane.PLAIN_MESSAGE ); if(a.equals("*")) JOptionPane.showMessageDialog( null, "The sum is " + mul, "Results", JOptionPane.PLAIN_MESSAGE ); if(a.equals("/")) JOptionPane.showMessageDialog( null, "The sum is " + div, "Results", JOptionPane.PLAIN_MESSAGE ); System.exit( 0 ); // terminate the program }}
简单的java程序通过对话框输出 计算加减乘除运算（运算方法可选择）
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