(20 )阅读下面程序import javax.swing.JOptionPane;public class Comparison {public static vo
(20 )阅读下面程序
import javax.swing.JOptionPane;
public class Comparison {
public static void main(String args[] ){
String firstNumber, // 用户输入第 1 个数据变量
secondNumber, // 用户输入第 2 个数据变量
result; // 输出结果变量
int number1, // 用于比较的第 1 个数
number2; // 用于比较的第 2 个数
// 用户输入第 1 个数据的字符串
firstNumber = JOptionPane.showInputDialog(" 输入第 1 个整数 :" );
// 用户输入第 2 个数据的字符串
secondNumber = JOptionPane.showInputDialog(" 输入第 2 个整数 :" );
// 将字符串转换为整数类型
number1 = Integer.parseInt(firstNumber );
number2 = Integer.parseInt(secondNumber );
// 初始化结果变量
______________________;
// 比较两个数据
if (number1 == number2 )
result += number1 + " == " + number2;
if (number1 != number2 )
result += number1 + " != " + number2;
if (number1 < number2 )
result = result + "\n" + number1 + " < " + number2;
if (number1 > number2 )
result = result + "\n" + number1 + " > " + number2;
if (number1 <= number2 )
result = result + "\n" + number1 + " <= " + number2;
if (number1 >= number2 )
result = result + "\n" + number1 + " >= " + number2;
// 显示结果
JOptionPane.showMessageDialog(null,result," 比较结果 ",
JOptionPane.INFORMATION_MESSAGE );
System.exit(0 );
}
}
为使程序能正确运行并得到合理的输出结果,初始化结果变量语句 (下划线处 ) 应是
A ) result = ""
B ) result = null
C ) result = number1
D ) result = number2