【JAVA】输入输出方法

输出：

The showMessageDialog Method：

JOptionPane.showMessageDialog(null, 
  "Welcome to Java!", 
  “Display Message",    
  JOptionPane.INFORMATION_MESSAGE));

输入：

1.showInputDialog

firstNumber = JOptionPane.showInputDialog(    "Enter first integer:");

2.Scanner

Scanner input = new Scanner(System.in);
balance=input.nextDouble();