Java 课后作业 加减乘除运算 消息框显示结果

//This is a program to calculate numbers with + - * /
//牟亚超
package 加减乘除运算;
import javax.swing.JOptionPane;  // import class JOptionPane

public class Counter {
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
minus,            //minus of number1 and number2
mult;              //multiplicative of two numbers
float division;      //division of two numbers

// 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;
//minus the numbers
minus = number1 - number2;
//multiplicative the numbers
mult = number1 * number2;
//division the numbers
division = number1 / number2;

// display the results
JOptionPane.showMessageDialog(
null, "The sum is " + sum+
"\nThe minus is "+minus+
"\nThe multiplication is "+mult+
"\nThe division is "+division,"Results",
JOptionPane.PLAIN_MESSAGE );

System.exit( 0 );   // terminate the program
}

}