【Java】实现一个根据日期判断星座程序的编写
思路
直接根据月份做索引,然后根据日期边界判断是本月的星座还是上月的。
算法
private static String getAstro(int month, int day) { String[] starArr = {"魔羯座","水瓶座", "双鱼座", "牡羊座", "金牛座", "双子座", "巨蟹座", "狮子座", "处女座", "天秤座", "天蝎座", "射手座" }; int[] DayArr = {22, 20, 19, 21, 21, 21, 22, 23, 23, 23, 23, 22}; // 两个星座分割日 int index = month; // 所查询日期在分割日之前,索引-1,否则不变 if (day < DayArr[month - 1]) { index = index - 1; } // 返回索引指向的星座string return starArr[index]; }
最终的效果图
初始图:
选择图:
判断星座
Java代码
package com.test0803; import java.awt.*; import java.awt.event.*; import javax.swing.*; import java.util.*; /* * * */ class MyFrameee extends JFrame implements ItemListener { private JComboBox day = new JComboBox(), month = new JComboBox(); private JLabel tip = new JLabel("请选择日期"); public static final String[] starArr = {"魔羯座","水瓶座", "双鱼座", "牡羊座", "金牛座", "双子座", "巨蟹座", "狮子座", "处女座", "天秤座", "天蝎座", "射手座" }; public static final int[] DayArr = {22, 20, 19, 21, 21, 21, 22, 23, 23, 23, 23, 22}; MyFrameee() { super("星座计算"); for (int i = 1; i <= 12; i++) { //void addItem(Object anObject) 为项列表添加项。 month.addItem(String.valueOf(i)); } for (int i = 1; i <= 31; i++) { day.addItem(String.valueOf(i)); } //setForeground:设置此组件的前景色。 tip.setForeground(Color.blue); Container con = getContentPane(); con.setLayout(new FlowLayout()); con.add(month); con.add(new JLabel("月-")); con.add(day); con.add(new JLabel("日")); con.add(tip); day.addItemListener(this); month.addItemListener(this); setSize(280, 100); setLocation(400, 300); setVisible(true); setResizable(false); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } public static String getConstellation(Calendar time) { int month = time.get(Calendar.MONTH); int day = time.get(Calendar.DAY_OF_MONTH); if (day < DayArr[month]) { month = month - 1; } if (month >= 0) { return starArr[month]; } return starArr[0]; } public void itemStateChanged(ItemEvent e) { Calendar date = Calendar.getInstance(); date.set(2010, Integer.parseInt((String) month.getSelectedItem()), Integer.parseInt((String) day.getSelectedItem())); tip.setText(getConstellation(date)); } } public class Test_Star2 { public static void main(String[] args) { new MyFrameee(); } }
不足之处
为了方便,没有确定特殊月份的日期数量,都是按照31天处理的。