学习Java第二天

来源：互联网发布：手动按摩器小型淘宝编辑：程序博客网时间：2024/05/16 00:44

单词含义
import导入、public公开、class类、static静态、string字符串、void空的、main类的主方法
输出语句
System.out.println();
int整数、double小数
快捷键
alt+/是eclipse（IDE工具）错误帮助
ctrl+1是调出错误帮助选项框
ctrl+F11是编译解释快捷键

基本运算程序

import javax.swing.JOptionPane;public class Calc {        public static void main(String[] args) {        double num1 = 999;        double num2 = 777;        System.out.println(num1 + "+" + num2 + "=" + (num1 + num2));        System.out.println(num1 + "-" + num2 + "=" + (num1 - num2));        System.out.println(num1 + "*" + num2 + "=" + (num1 * num2));        System.out.println(num1 + "/" + num2 + "=" + (num1 / num2));        JOptionPane.showMessageDialog(null,num1 + "+" + num2 + "=" + (num1 + num2));        JOptionPane.showMessageDialog(null,num1 + "-" + num2 + "=" + (num1 - num2));        JOptionPane.showMessageDialog(null,num1 + "*" + num2 + "=" + (num1 * num2));        JOptionPane.showMessageDialog(null,num1 + "/" + num2 + "=" + (num1 / num2));        System.exit(0);    }}

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