Java Programing

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二叉树遍历

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import java.util.Scanner;
public class Solution {
public static void main(String[] args) {
	TreeNode root=null;
	root=CreatBinaryTree();
	inorderTraversal(root);
}
public static TreeNode CreatBinaryTree(){
	TreeNode t=null;
	@SuppressWarnings("resource")
	Scanner scaner = new Scanner(System.in);
	String s = scaner.next();
	char c = s.charAt(0);
	int val=c-'0';
	
	if(c!='#') 
	{
		t=new TreeNode(val);
		t.left=CreatBinaryTree();
		t.right=CreatBinaryTree();
	}
	return t;
}
public static void inorderTraversal(TreeNode root) {
       // write your code here
	if(root!=null)
       {
	inorderTraversal(root.left);
       System.out.print(root.val+" ");
       inorderTraversal(root.right);
       }
   }
   }

国庆节小动画程序

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import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
public class GuoqingStart extends JFrame {
   	Guoqing gq;
   	public static void main(String[] args) {
       	new GuoqingStart();
   	}
   	public GuoqingStart() {
       	gq=new Guoqing();
       	this.addMouseListener(gq);
       	this.add(gq);
       	new Thread(gq).start();
       	this.setTitle("国庆快乐");
       	this.setLocation(100, 0);
       	this.setSize(1000,700);
       	this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
       	this.setVisible(true);
   	}
}
class Guoqing extends JPanel implements MouseListener,Runnable{
   	Bullet bullet;
   	Vector<Bullet> bullets;
   	static Vector<Piece> pieces;
   	int times=1;
   	public Guoqing() {
      		bullets=new Vector<Bullet>();
       	pieces=new Vector<Piece>();
   	}
   	public void paint(Graphics g) {
       	super.paint(g);
       	times++;
       	g.setColor(Color.black);
       	g.fillRect(0, 0, 2000, 1000);
       	g.setColor(Color.lightGray);
       	for(int i=0;i<this.bullets.size();i++){
           	Bullet b=this.bullets.get(i);
           	if(b.isLive){
               	b.move();
               	g.fillOval(b.x,b.oldY, 15, 15);
           	}
       	}
       	for(int i=0;i<this.pieces.size();i++){
           Piece b=this.pieces.get(i);
           if(b.isLive){
               if(b.color==0){
                   g.setColor(Color.red);
               }else if(b.color==1){
                   g.setColor(Color.blue);
               }else if(b.color==2){
                   g.setColor(Color.cyan);
               }else if(b.color==3){
                   g.setColor(Color.green);
               }else{
                   g.setColor(Color.gray);
               }
               if(times%2==0){
                   b.move();
               }
               g.fillOval((int)b.x, (int)b.y, (int)b.w, (int)b.h);
           }
       }
   	}
   	public void mousePressed(MouseEvent e) {
       	bullet=new Bullet(e.getX(),e.getY());
       	this.bullets.add(bullet);
   	}
   	public void mouseClicked(MouseEvent e) {}
   	public void mouseReleased(MouseEvent e) {}
   	public void mouseEntered(MouseEvent e) {}
   	public void mouseExited(MouseEvent e) {}
   	@Override
   	public void run() {
       while(true){
           this.repaint();
           try {
               Thread.sleep(10);
           } catch (Exception e) {
               e.printStackTrace();
           }
       }
   }
}
class Piece{
   	double x,y;
   	double w=15;
   	double h=15;
   	double velocityX, velocityY;
   	boolean isLive=true;
   	int color=0;
   	int times=1;
   	public Piece(double x,double y,double velocity,double angle,int color) {
       this.x=x;
       this.y=y;
       this.color=color;
       velocityX = velocity * Math.cos(angle);
       velocityY = velocity * Math.sin(angle);
   }
   public void move(){
       velocityX *= 0.75;
       velocityY += 1.0;
       velocityY *= 0.75;
       y += velocityY;
       x += velocityX;
       times++;
       if(times%7==0){
           this.w-=2;
           this.h-=2;
           if(this.w<=4){
               Guoqing.pieces.remove(this);
           }
       }
   }
}
class Bullet{
   int x;
   int y;
   int oldY=700;
   boolean isLive=true;
   Piece piece;
   Random r=new Random(System.currentTimeMillis());
   public Bullet(int x, int y) {
       this.x = x;
       this.y = y;
   }
   public void move(){
       oldY-=8;
       if(oldY<=y){
           this.isLive=false;
           int color=r.nextInt(4);
           for(int i=0;i<200;i++){
               double angleXy = r.nextDouble() * 2 * Math.PI;
               double angleZ  = r.nextDouble() * 2 * Math.PI;
               double velocity = 72 * Math.cos(angleZ);
               piece=new Piece(x,oldY,velocity, angleXy,color);
               Guoqing.pieces.add(piece);
           }
       }
   }
   }