JAVA经典实用程序代码(2)

d_one = \ operator = \ jtx.setText(\ return; }

/*暂未实现该功能*/ if(\ return; }

/*记录运算符，保存运算数字*/ if ((\ if(\ d_one = jtx.getText(); operator = conn; jtx.setText(\ return; }

/*计算结果*/

if (\ if(\ double db = 0; if (\ db = Double.parseDouble(d_one) + Double.parseDouble(jtx.getText()); jtx.setText(db + \ } if (\ db = Double.parseDouble(d_one) - Double.parseDouble(jtx.getText()); jtx.setText(db + \ } if (\ db = Double.parseDouble(d_one) * Double.parseDouble(jtx.getText()); jtx.setText(db + \ } if (\ db = Double.parseDouble(d_one) / Double.parseDouble(jtx.getText()); jtx.setText(db + \ } d_one = db + \ return; }

//界面显示 jtx.setText(jtx.getText() + conn); } }

6三角形图案

package pm;

public class SwitchTest{ public static void main(String[] args){ int n=5; for(int i=0;i<=n;i++){ for(int j=0;j

7输出输入的姓名

package pm;

import java.util.Scanner; public class SwitchTest{ public static void main(String[] args){ String name=null; Scanner sca=new Scanner (System.in); char firstChar; do{ System.out.println(\ name=sca.nextLine(); firstChar=name.charAt(0); }while(!(firstChar>='a' && firstChar<='z' ||

firstChar>='A' && firstChar<='Z')); System.out.println(\ } }

8一小时倒计时小程序

package pm;

import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel;

public class SwitchTest { private JFrame frame; private JLabel jl1; private JLabel jl2; private JLabel jl3; /*主方法*/ public static void main(String[] args) { new SwitchTest().getTime(); } /*倒计时的主要代码块*/ private void getTime(){ long time=1*3600; long hour =0 ; long minute =0 ; long seconds=0; while(time>=0){ hour=time/3600; minute=(time-hour*3600)/60; seconds=time-hour*3600-minute*60; jl1.setText(hour+\时\ jl2.setText(minute+\分\

jl3.setText(seconds+\秒\ try { Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } time--; } } /*构造 实现界面的开发 GUI */ public SwitchTest(){ frame = new JFrame(\倒计时\ jl1 = new JLabel(); jl2 = new JLabel(); jl3 = new JLabel(); init(); } /*组件的装配*/ private void init(){ JPanel jp=new JPanel(); jp.add(jl1); jp.add(jl2); jp.add(jl3); frame.add(jp); frame.setVisible(true); frame.setLocation(300,400); frame.setSize(300, 200); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } }

9棋盘图案

public class Sjx{

public static void main(String[] args){ int SIZE=19; for(int i=0;i

public class ArrayTest {

public static void main(String[] args){ char[][] arr=new char[4][7]; String s=\朝辞白帝彩云间千里江陵一日还两岸猿声啼不住轻舟已过万重山\ for(int i=0;i