//都是從新手過來的,以下代碼供參考
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//1.
public?class?BankAccount?{
private?static?String?acctnum;
private?static?double?money;
private?static?void?showAcct()?{
System.out.println("賬號(hào)為:?"?+?acctnum);
}
private?static?void?showMoney()?{
System.out.println("余額為:?"?+?money);
}
public?BankAccount(String?acc,?double?m)?{
this.acctnum?=?acc;
this.money?=?m;
}
public?static?void?main(String[]?args)?{
BankAccount?ba?=?new?BankAccount("626600018888",?5000.00);
ba.showAcct();
ba.showMoney();
}
}
//2.
public?class?Triangle?{
private?static?float?a;
private?static?float?b;
private?static?float?c;
public?Triangle(float?a,?float?b,?float?c)?{
this.a?=?a;
this.b?=?b;
this.c?=?c;
}
public?static?boolean?judgeTriangle(float?a,?float?b,?float?c)?{
if?((a??Math.abs(b?-?c)??a??b?+?c)
?(b??Math.abs(a?-?c)??b??a?+?c)
?(c??Math.abs(a?-?b)??c??a?+?b))
return?true;
else
return?false;
}
public?float?getCircumference()?{
return?this.a?+?this.b?+?this.c;
}
}
//3.
public?class?TestTriangle?{
public?static?void?main(String[]?args)?{
Triangle?t?=?new?Triangle(5.3f,7.8f,9.3f);
if(t.judgeTriangle(5.3f,7.8f,9.3f)){
System.out.print("能夠成三角形,周長(zhǎng)為:?");
System.out.printf("%9.2f",t.getCircumference());}
else
System.out.println("不能構(gòu)成三角形");
}
}
add(new JLabel(lightIcon));
add(new JLabel(roomIcon));
這個(gè)里面?zhèn)鞯膮?shù)不對(duì),你看看文檔
public?static?void?main(String[]?args)?{
//控制臺(tái)輸入
Scanner?scan?=?new?Scanner(System.in);
//三次機(jī)會(huì)
for?(int?i?=?2;?i?=?0;?i--)?{
//提示用戶輸入
System.out.println("請(qǐng)輸入用戶名");
//用戶名
String?userName?=?scan.next();
//提示用戶輸入
System.out.println("請(qǐng)輸入密碼");
//密碼
String?password?=?scan.next();
//如果輸入正確,??break,結(jié)束循環(huán)
if("jim".equals(userName)??"123456".equals(password))?{
System.out.println("歡迎登錄MyShopping系統(tǒng)");
break;
}
else?{
if(i??0)?{
System.out.println("密碼錯(cuò)誤,你還有"+i+"次機(jī)會(huì)!");
continue;
}
if(i?==?0)?{
System.out.println("密碼錯(cuò)誤,三次機(jī)會(huì)已用完!");
}
}
}
}
public class TestStar {
public static void main(String[] args) {
String star = "*";
for (int i = 0; i 5; i++) {
if (i == 0) {
System.out.print(" " + star);
System.out.println();
}
if (i == 1) {
for (int z = 0; z 4; z++) {
System.out.print(" " + star);
}
System.out.println();
}
if (i == 2) {
System.out.print(" ");
for (int x = 0; x 3; x++) {
System.out.print(" " + star);
}
System.out.println();
}
if (i == 3) {
for (int y = 0; y 2; y++) {
System.out.print(" " + star + " ");
}
}
}
}
}
是好使的 但是我沒找到畫五角星有什么規(guī)律(五角星好象不是正規(guī)圖形吧?)如果還有什么要求的話 補(bǔ)充問題(如果是用*填充所有的東西 不包括 “ ”的話 我可以重新再給你寫一個(gè))
最簡(jiǎn)單的java代碼肯定就是這個(gè)了,如下:
public class MyFirstApp
{
public static void main(String[] args)
{
System.out.print("Hello world");
}
}
“hello world”就是應(yīng)該是所有學(xué)java的新手看的第一個(gè)代碼了。如果是零基礎(chǔ)的新手朋友們可以來我們的java實(shí)驗(yàn)班試聽,有免費(fèi)的試聽課程幫助學(xué)習(xí)java必備基礎(chǔ)知識(shí),有助教老師為零基礎(chǔ)的人提供個(gè)人學(xué)習(xí)方案,學(xué)習(xí)完成后有考評(píng)團(tuán)進(jìn)行專業(yè)測(cè)試,幫助測(cè)評(píng)學(xué)員是否適合繼續(xù)學(xué)習(xí)java,15天內(nèi)免費(fèi)幫助來報(bào)名體驗(yàn)實(shí)驗(yàn)班的新手快速入門java,更好的學(xué)習(xí)java!
題目:一球從100米高度自由落下,每次落地后反跳回原高度的一半;再落下,求它在 第10次落地時(shí),共經(jīng)過多少米?第10次反彈多高?
這個(gè)題目,下面我會(huì)貼出來兩種代碼。其實(shí)這個(gè)題目,我煩了簡(jiǎn)單計(jì)算,想搞得有趣味性一點(diǎn),結(jié)果耽誤了好幾天時(shí)間,最后發(fā)現(xiàn)搞的也不好。
先第一種,為了解題而解題。
==== Main.java ====
public class Main {
private double TotalHeight = 100;
private double CurHeight = 50;
public void drop(int times) {
if ((times - 1) == 0) {
return;
}
setTotalHeight(getTotalHeight() + 2 * getCurHeight());
setCurHeight(getCurHeight() / 2);
drop(times - 1);
}
public double getTotalHeight() {
return TotalHeight;
}
public void setTotalHeight(double totalHeight) {
TotalHeight = totalHeight;
}
public double getCurHeight() {
return CurHeight;
}
public void setCurHeight(double curHeight) {
CurHeight = curHeight;
}
public static void main(String[] args) {
Main main = new Main();
main.drop(2);
System.out.println("Total height is " +
main.getTotalHeight());
System.out.println("Current height is " +
main.getCurHeight());
}
}
==== 然后是第二種 =====
==== Main.java ====
package main;
import javax.swing.JFrame;
import panel.BallPanel;
import time.Delay;
public class MainFrame extends JFrame {
public MainFrame(String title) {
super(title);
}
public static void main(String[] args) {
Delay delay = new Delay();
MainFrame frame = new MainFrame("Hello JFrame");
BallPanel ballPanel = new BallPanel();
frame.add(ballPanel);
frame.setSize(500, 500);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
delay.initDelay();
ballPanel.setDelay(delay.getDelay());
ballPanel.loopDrop(0);
}
}
==== Delay.java ====
package time;
public class Delay {
public void initDelay() {
int g = 10;
int i = 0;
double s, t, t0 = 0.0;
delay = new int[100];
for (s = 100; s 10100; s += 100) {
t = Math.sqrt(2 * s / g);
delay[i++] = (int) ((t - t0) * 100);
t0 = t;
}
}
public int[] getDelay() {
return delay;
}
private int delay[];
}
==== BallPanel.java ====
package panel;
import java.awt.Color;
import java.awt.Graphics;
import javax.swing.JPanel;
public class BallPanel extends JPanel {
public BallPanel() {
super();
}
public void paint(Graphics g) {
g.clearRect(0, 0, this.getWidth(), this.getHeight());
g.setColor(Color.BLUE);
g.fillOval(250, ballCenter, 30, 30);
}
public void loopDrop(int height) {
int i;
if (this.height == height) { // At bottom
for (i = 0; i targetHeight; i += MUL) {
ballCenter = this.height - i;
this.repaint();
try {
Thread.sleep(delay[(targetHeight - i - 1) / MUL]);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
loopDrop(this.height - i);
} else { // At top
for (i = height; i this.height; i += MUL) {
ballCenter = i;
this.repaint();
try {
Thread.sleep(delay[(i - height) / MUL]);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
targetHeightV = targetHeightV / 2;
targetHeight = targetHeightV;
if (targetHeight != 0) {
loopDrop(i);
}
}
}
public void setDelay(int delay[]) {
this.delay = delay;
}
private int extracted() {
return 100 * MUL;
}
private int targetHeight = extracted();
private int targetHeightV = extracted();
private int ballCenter = 0;
private int height = extracted();
private int delay[];
private final int MUL = 4;
}
其實(shí)所謂的第二種,是用的JFrame在JPanel上畫圖,直觀的展示出來每次彈起來的效果。因?yàn)?00像素實(shí)在太小了,所以我做了一個(gè)變量MUL,相
當(dāng)于是等比例擴(kuò)大的效果。問題就是彈不到10次距離就用光了,所以。。。。。權(quán)當(dāng)娛樂了。。當(dāng)然可以等比例在放大,例如100M看成是10000像素,這
樣能多彈幾次。這個(gè)程序,最后球就在那里不動(dòng)了,程序不會(huì)自己退出。