简单代码20160905

包括获取时间
GUI_从输入对话框中获取输入

示例代码：

package Chapter02;

import java.util.Scanner;

import javax.swing.JOptionPane;
/**
 * chapter02_example
 * @author gt.liu
 * time 2016年9月5日 下午4:15:20
 * java_basis Chapter02 example01.java
 */
public class example01 {

    public static void main(String[] args) {

        //circlearea01();
        //circlearea02();
        //DataTypeandValue();
        //wenduzhuanhuan();
        //shijianxianshi();
        //xiaoshudian();
        //lilvyuezhifuedu();
        //charleixing();
        //zhengqianlingdui();
        //stringleixing();
        //guishuru();
        lilvyuezhifueduGUI();
    }

    public static void circlearea01(){
        double PI = 3.14;
        double radius;
        double area;
        radius = 10;
        area = PI * radius * radius;
        System.out.println("radius = " + radius + "\tcircle_area = " + area);
    }

    public static void circlearea02(){
        System.out.print("Enter a number: ");
        Scanner input = new Scanner(System.in);
        double radius1 = input.nextDouble();
        System.out.println("radius1 = " + radius1);
        double area1 = 3.14 * radius1 * radius1;
        System.out.println("area1 = " + area1);

        System.out.print("Enter a number: ");
        double radius2 = input.nextDouble();
        System.out.println("radius2 = " + radius2);
        double area2 = 3.14 * radius2 * radius2;
        System.out.println("area2 = " + area2);
        input.close();
    }

    public static void DataTypeandValue() {
        final int xx;
        xx = 10;
        System.out.println("xx = " + xx);
        System.out.println(Integer.MAX_VALUE);
        System.out.println(Integer.MIN_VALUE);
        System.out.println(Double.MAX_VALUE);

        System.out.println("进制");
        System.out.println(011);//八进制
        System.out.println(0xffff);//十六进制

    }

    public static void wenduzhuanhuan(){
        Scanner input = new Scanner(System.in);
        System.out.print("Enter a number: ");
        double huashiwendu = input.nextDouble();
        double sheshiwendu = (5/9.0) * (huashiwendu - 32);//注意，两个整数相除的商为整数
        System.out.println("huashiwendu = " + huashiwendu + "\tsheshiwendu = " + sheshiwendu);
        input.close();
    }

    public static void shijianxianshi() {
        System.out.println(System.currentTimeMillis());
        long totalmilliseconds = System.currentTimeMillis();// 毫秒数

        long totalseconds = totalmilliseconds / 1000;// 秒数
        long currentseconds = totalseconds % 60;// 当前秒数

        long totalminutes = totalseconds / 60;// 分钟数
        long currentminutes = totalminutes % 60;// 当前分钟数

        long totalhours = totalminutes / 60;// 小时数
        long currenthours = totalhours % 24 + 8;// 当前小时数，+8的意思是北京时间与GMT时间有8个小时的时差

        System.out.println("current time: " + currenthours + ":" + currentminutes + ":" + currentseconds);
    }

    public static void xiaoshudian() {
        Scanner input = new Scanner(System.in);
        System.out.print("Enter a number: ");
        double data = input.nextDouble();
        double tax = data * 0.06;
        System.out.println("保留两位小数的tax = " + (int) (tax * 100) / 100.0);
        input.close();
    }

    public static void lilvyuezhifuedu() {
        Scanner input = new Scanner(System.in);
        System.out.print("输入贷款总额：");
        double daikuanzonge = input.nextDouble();
        System.out.print("输入年利率：");
        double nianlilv = input.nextDouble();
        System.out.print("输入年限：");
        double nianshu = input.nextDouble();

        double yuelilv = nianlilv / 1200;// 计算月利率
        double fenzi = daikuanzonge * yuelilv;

        double jianshufenmu = Math.pow((1 + yuelilv), (nianshu * 12));
        double fenmu = 1 - (1 / jianshufenmu);

        double yuezhifue = fenzi / fenmu;
        System.out.println("月支付额：" + (int) (yuezhifue * 100) / 100.0);
        System.out.println("总支付额：" + (int) (yuezhifue * nianshu * 12 * 100) / 100.0);
        input.close();
    }

    public static void charleixing() {
        char leter1 = 'a';
        char leter2 = 'd';
        System.out.println(leter1 + "\t" + leter2);
        System.out.println(++leter1);// 可以自加
        char leter3 = '\u6b22';
        char leter4 = '\u8fce';
        System.out.println(leter3 + "" + leter4);
        System.out.println(++leter3);// 可以自加自减，得到后面或者前面的unicode字符
        System.out.println('u');
        JOptionPane.showMessageDialog(null, "内容", "标题", JOptionPane.INFORMATION_MESSAGE);
    }

    public static void zhengqianlingdui() {
        // 整钱零兑
        Scanner input = new Scanner(System.in);
        System.out.print("money: ");
        double allmoney = input.nextDouble();
        int allmoneyfen = (int) (allmoney * 100);
        int yuandanwei = allmoneyfen / 100;// 单位元
        allmoneyfen %= 100;
        int erjiaowufen = allmoneyfen / 25;// 单位两角五分
        allmoneyfen %= 25;
        int yijiao = allmoneyfen / 10;// 单位一角
        allmoneyfen %= 10;
        int wufen = allmoneyfen / 5;// 单位五分
        allmoneyfen %= 5;
        int yifen = allmoneyfen;// 单位一分
        System.out.println("总钱数：" + allmoney);
        System.out.println("元：" + yuandanwei);
        System.out.println("两角五分：" + erjiaowufen);
        System.out.println("一角：" + yijiao);
        System.out.println("五分：" + wufen);
        System.out.println("一分：" + yifen);
        input.close();
    }

    public static void stringleixing(){
        String message = "string lei xing";
        System.out.println(message);

        String s1 = "chapter";
        System.out.println(s1 + 2);
        s1 += " two";
        System.out.println(s1);

        System.out.print("Enter String s2 nextline() :  ");
        Scanner input = new Scanner(System.in);
        String s2 = input.nextLine();
        System.out.print("Enter String s3 next() :  ");
        String s3 = input.next();
        System.out.println("s2 = " + s2);
        System.out.println("s3 = " + s3);
        System.out.println(s2 + s3);
        input.close();

        String s4 = JOptionPane.showInputDialog(null,"内容是", "标题", JOptionPane.QUESTION_MESSAGE);
        System.out.println("s4 = " + s4);

        //将字符串转换为数字
        //int shuzi = Integer.parseInt(s2);
        //System.out.println("shuzi" + shuzi);
    }

    public static void guishuru(){
        System.out.println("gui 从输入对话框获取输入");
        String s = JOptionPane.showInputDialog(null,"输入String","标题",JOptionPane.QUESTION_MESSAGE);
        System.out.println("s = " + s);
        int xx = Integer.parseInt(s);
        System.out.println("xx = " + xx);

        String output = "String type s = " + s + "\nint type xx = " +xx;
        JOptionPane.showMessageDialog(null, output);
    }

    public static void lilvyuezhifueduGUI() {
        String nianlilvString = JOptionPane.showInputDialog(null, "年利率，例如8.25", "输入年利率", JOptionPane.QUESTION_MESSAGE);
        double nianlilv = Double.parseDouble(nianlilvString);// 年利率
        double yuelilv = nianlilv / 1200;// 月利率

        String nianshuString = JOptionPane.showInputDialog(null, "年数，例如5", "输入年数", JOptionPane.QUESTION_MESSAGE);
        int nianshu = Integer.parseInt(nianshuString);// 年数

        String daikuaneString = JOptionPane.showInputDialog(null, "贷款额，例如12000", "贷款额", JOptionPane.QUESTION_MESSAGE);
        double daikuane = Double.parseDouble(daikuaneString);// 贷款额

        double fenzi = daikuane * yuelilv;// 求月支付额时的分子
        double fenbu1 = Math.pow((1 + yuelilv), (nianshu * 12));
        double fenmu = 1 - 1 / (fenbu1);
        double yuezhifue = fenzi / fenmu;// 月支付额
        double zongzhifue = yuezhifue * nianshu * 12;// 总支付额

        // 为保留两位小数
        yuezhifue = (int) (yuezhifue * 100) / 100.0;
        zongzhifue = (int) (zongzhifue * 100) / 100.0;

        // 输出
        String output = "贷款总额：" + daikuane + "\n年限：" + nianshu + "\n年利率：" + nianlilv + "\n*********\n" + "月支付额："
                + yuezhifue + "\n总支付额：" + zongzhifue;
        JOptionPane.showMessageDialog(null, output, "计算输出", JOptionPane.INFORMATION_MESSAGE);

    }
}