java简单代码，能给我一个最简单的java程序代码吗

1 ，能给我一个最简单的java程序代码吗public String str()java语言：public class XXX{public static void main(String args[]){system.out.println("Hello world!");}}public class 11{public static void main(String args[]){ system.out.println("Hello world!");}}
2，简单JAVA代码的确好难~~但我看明白了。例如当你输入了15个51-60的数， 10个1-10的数6个11到20的数输出为1-10/**11-20/*21-30/31-40/41-50/51-60/***61-70/71-80/81-90/91-100/注：51-60之间的数有15个（3个5），故有3颗星星星的数量是统计得到的你曾经输入的数的5的倍数，你输入的数越多，星星会增加~~运行下看看。楼上（不是楼主）怎么想的。。。再添一点，s是String类型，初始值s[0]-s[9]均为“”，分别为十个数段的星星字符串，s[（(b+9)/10）-1]（注意运算顺序） b是51的时候就是s[5]啦~~~~还不明白告诉我，我加你qq说首先要明白set是java的一个集合类的接口。。。用来封装复杂的数据类型。。。set keys = map.keyset();--->获取所有的key放到set集合中保存。。。也就是“key1--->key4”；for(object key : keys)system.out.println(map.get(key));}这段循环就是循环去除set集合中的key，然后通过map.get(key)获取到key所对应的值，比如：key1--->value1
3，java做一个能录入的简单的代码import java.util.Scanner;class student public String name; public int id; public String subject; public double score;}public class Test public static void main(String[] args) Scanner scanner = new Scanner(System.in); //创建学生对象 student stu = new student(); System.out.print("输入id："); stu.id = scanner.nextInt(); System.out.print("输入姓名："); stu.name = scanner.next(); System.out.print("输入subject："); stu.subject = scanner.next(); System.out.print("输入分数："); stu.score = scanner.nextDouble(); System.out.println("姓名：" + stu.name + ". id ： " + stu.id + ". 科目： " + stu.subject + ". 分数：" + stu.score); }}【java简单代码，能给我一个最简单的java程序代码吗】
4，求段简单JAVA的代码import java.io.*; public class Testpublic static void main(String s[])byte[] b1=new byte[3];byte[] b2=new byte[3];tryFile f=new File("F:\\\\11.txt");RandomAccessFile raf=new RandomAccessFile(f,"rw");long len=raf.length();raf.read(b1,0,3);String str=bytesToHexString(b1);System.out.println("前三个字节哈希码是："+b1.toString());System.out.println("转换为十六进制后是："+str);raf.seek(len-3);//raf.read(b2,(int)(len-3),3);b2[0]=raf.readByte();b2[1]=raf.readByte();b2[2]=raf.readByte();str=bytesToHexString(b2);System.out.println("后三个自己哈希码是："+b2.toString());System.out.println("转换为十六进制后是："+str);}catch(Exception e)} public static final String bytesToHexString(byte[] bArray)StringBuffer sb = new StringBuffer(bArray.length);String sTemp;for (int i = 0; i < bArray.length; i++)sTemp = Integer.toHexString(0xFF & bArray[i]);if (sTemp.length() < 2)sb.append(0);sb.append(sTemp.toUpperCase());}return sb.toString(); } }主要的除了转16进制，就是用RandomAccessFile的seek来快速定位倒数的三个字节的位置。还有问题的话，baiduhi我，随时在线5，求一个简单又有趣的JAVA小游戏代码那你就自己做个猜数字好了import java.util.*; import java.io.*; public class CaiShupublic static void main(String[] args) throws IOExceptionRandom a=new Random(); int num=a.nextInt(100); System.out.println("请输入一个100以内的整数："); for (int i=0;i<=9;i++)BufferedReader bf=new BufferedReader(new InputStreamReader(System.in)); String str=bf.readLine(); int shu=Integer.parseInt(str); if (shu>num) System.out.println("输入的数大了，输小点的！"); else if (shu<num) System.out.println("输入的数小了，输大点的！"); else System.out.println("恭喜你，猜对了！"); if (i<=2) System.out.println("你真是个天才！"); else if (i<=6) System.out.println("还将就，你过关了！"); else if (i<=8) System.out.println("但是你还……真笨！"); else System.out.println("你和猪没有两样了！"); break;} } } }import java.util.Scanner;import java.util.Random;public class Fangfastatic int sum,sum1=0; public static void main(String [] args)int a=1,b=1,c=1; int k=0,m=1; int money =5000; int zhu =0; boolean flag = true; Random rand = new Random(); Scanner input = new Scanner(System.in); while(m==1) while(flag) System.out.println("掷色子开始！"); System.out.println("请下注注:下注金额只能是50的倍数且不能超过1000"); zhu=input.nextInt(); if(zhu%50==0&&zhu<=1000&&zhu<=money)System.out.println("下注成功");System.out.println("买大请输入数字1，买小输入数字2");k=input.nextInt();a= rand.nextInt(6)+1;b= rand.nextInt(6)+1;c= rand.nextInt(6)+1;sum=a+b+c;if(k==1)if(sum>9)money+=zhu;System.out.println("恭喜您猜对了,骰子点数为"+sum+"结果是大"+"余额为"+money);}elsemoney-=zhu;System.out.println("很遗憾,骰子点数为"+sum+"结果是小"+"余额为"+money);}}if(k==2)if(sum<=9)money+=zhu;System.out.println("恭喜您猜对了,骰子点数为"+sum+"结果是小"+"余额为"+money);}elsemoney-=zhu;System.out.println("很遗憾,骰子点数为"+sum+"结果是大"+"余额为"+money);}}flag= false;System.out.println("继续请按1,退出请按任意键");m=input.nextInt();if(m==1)flag=true;System.out.println("您选择的是继续");}elseflag=false;System.out.println("欢迎您下次再来玩");}}elseSystem.out.println("下注失败"+"余额为"+money);}} }}}import java.util.Scanner;import java.util.Random;public class Fangfastatic int sum,sum1=0; public static void main(String [] args)int a=1,b=1,c=1; int k=0,m=1; int money =5000; int zhu =0; boolean flag = true; Random rand = new Random(); Scanner input = new Scanner(System.in); while(m==1) while(flag) System.out.println("掷色子开始！"); System.out.println("请下注注:下注金额只能是50的倍数且不能超过1000"); zhu=input.nextInt(); if(zhu%50==0&&zhu<=1000&&zhu<=money)System.out.println("下注成功");System.out.println("买大请输入数字1，买小输入数字2");k=input.nextInt();a= rand.nextInt(6)+1;b= rand.nextInt(6)+1;c= rand.nextInt(6)+1;sum=a+b+c;if(k==1)if(sum>9)money+=zhu;System.out.println("恭喜您猜对了,骰子点数为"+sum+"结果是大"+"余额为"+money);}elsemoney-=zhu;System.out.println("很遗憾,骰子点数为"+sum+"结果是小"+"余额为"+money);}}if(k==2)if(sum<=9)money+=zhu;System.out.println("恭喜您猜对了,骰子点数为"+sum+"结果是小"+"余额为"+money);}elsemoney-=zhu;System.out.println("很遗憾,骰子点数为"+sum+"结果是大"+"余额为"+money);}}flag= false;System.out.println("继续请按1,退出请按任意键");m=input.nextInt();if(m==1)flag=true;System.out.println("您选择的是继续");}elseflag=false;System.out.println("欢迎您下次再来玩");}}elseSystem.out.println("下注失败"+"余额为"+money);}} }}}连连看的小源码package Lianliankan;import javax.swing.*; import java.awt.*; import java.awt.event.*; public class lianliankan implements ActionListener JFrame mainFrame; //主面板 Container thisContainer; JPanel centerPanel,southPanel,northPanel; //子面板 JButton diamondsButton[][] = new JButton[6][5];//游戏按钮数组 JButton exitButton,resetButton,newlyButton; //退出，重列，重新开始按钮 JLabel fractionLable=new JLabel("0"); //分数标签 JButton firstButton,secondButton; //分别记录两次被选中的按钮 int grid[][] = new int[8][7];//储存游戏按钮位置 static boolean pressInformation=false; //判断是否有按钮被选中 int x0=0,y0=0,x=0,y=0,fristMsg=0,secondMsg=0,validateLV; //游戏按钮的位置坐标 int i,j,k,n;//消除方法控制 public void init()mainFrame=new JFrame("JKJ连连看"); thisContainer = mainFrame.getContentPane(); thisContainer.setLayout(new BorderLayout()); centerPanel=new JPanel(); southPanel=new JPanel(); northPanel=new JPanel(); thisContainer.add(centerPanel,"Center"); thisContainer.add(southPanel,"South"); thisContainer.add(northPanel,"North"); centerPanel.setLayout(new GridLayout(6,5)); for(int cols = 0;cols < 6;cols++)for(int rows = 0;rows < 5;rows++ )diamondsButton[cols][rows]=new JButton(String.valueOf(grid[cols+1][rows+1])); diamondsButton[cols][rows].addActionListener(this); centerPanel.add(diamondsButton[cols][rows]); } } exitButton=new JButton("退出"); exitButton.addActionListener(this); resetButton=new JButton("重列"); resetButton.addActionListener(this); newlyButton=new JButton("再来一局"); newlyButton.addActionListener(this); southPanel.add(exitButton); southPanel.add(resetButton); southPanel.add(newlyButton); fractionLable.setText(String.valueOf(Integer.parseInt(fractionLable.getText()))); northPanel.add(fractionLable); mainFrame.setBounds(280,100,500,450); mainFrame.setVisible(true); } public void randomBuild() int randoms,cols,rows; for(int twins=1;twins<=15;twins++) randoms=(int)(Math.random()*25+1); for(int alike=1;alike<=2;alike++) cols=(int)(Math.random()*6+1); rows=(int)(Math.random()*5+1); while(grid[cols][rows]!=0) cols=(int)(Math.random()*6+1); rows=(int)(Math.random()*5+1); } this.grid[cols][rows]=randoms; } } } public void fraction()fractionLable.setText(String.valueOf(Integer.parseInt(fractionLable.getText())+100)); } public void reload() int save[] = new int[30]; int n=0,cols,rows; int grid[][]= new int[8][7]; for(int i=0;i<=6;i++) for(int j=0;j<=5;j++) if(this.grid[i][j]!=0) save[n]=this.grid[i][j]; n++; } } } n=n-1; this.grid=grid; while(n>=0) cols=(int)(Math.random()*6+1); rows=(int)(Math.random()*5+1); while(grid[cols][rows]!=0) cols=(int)(Math.random()*6+1); rows=(int)(Math.random()*5+1); } this.grid[cols][rows]=save[n]; n--; } mainFrame.setVisible(false); pressInformation=false; //这里一定要将按钮点击信息归为初始 init(); for(int i = 0;i < 6;i++)for(int j = 0;j < 5;j++ )if(grid[i+1][j+1]==0) diamondsButton[i][j].setVisible(false); } } } public void estimateEven(int placeX,int placeY,JButton bz) if(pressInformation==false) x=placeX; y=placeY; secondMsg=grid[x][y]; secondButton=bz; pressInformation=true; } else x0=x; y0=y; fristMsg=secondMsg; firstButton=secondButton; x=placeX; y=placeY; secondMsg=grid[x][y]; secondButton=bz; if(fristMsg==secondMsg && secondButton!=firstButton)xiao(); } } } public void xiao() if((x0==x &&(y0==y+1||y0==y-1)) || ((x0==x+1||x0==x-1)&&(y0==y)))remove(); } elsefor (j=0;j<7;j++ ) if (grid[x0][j]==0)if (y>j) for (i=y-1;i>=j;i-- )if (grid[x][i]!=0) k=0; break; } else} if (k==1) linePassOne(); } } if (y<j)for (i=y+1;i<=j ;i++ )if (grid[x][i]!=0)k=0; break; } else } if (k==1)linePassOne(); } } if (y==j ) linePassOne(); } } if (k==2) if (x0==x) remove(); } if (x0<x) for (n=x0;n<=x-1;n++ ) if (grid[n][j]!=0) k=0; break; } if(grid[n][j]==0 && n==x-1) remove(); } } } if (x0>x) for (n=x0;n>=x+1 ;n-- ) if (grid[n][j]!=0) k=0; break; } if(grid[n][j]==0 && n==x+1) remove(); } } } } } for (i=0;i<8;i++ ) if (grid[i][y0]==0) if (x>i) for (j=x-1;j>=i ;j-- ) if (grid[j][y]!=0) k=0; break; } else } if (k==1) rowPassOne(); } } if (x<i) for (j=x+1;j<=i;j++ ) if (grid[j][y]!=0) k=0; break; } else } if (k==1) rowPassOne(); } } if (x==i) rowPassOne(); } } if (k==2)if (y0==y) remove(); } if (y0<y) for (n=y0;n<=y-1 ;n++ ) if (grid[i][n]!=0) k=0; break; } if(grid[i][n]==0 && n==y-1) remove(); } } } if (y0>y) for (n=y0;n>=y+1 ;n--) if (grid[i][n]!=0) k=0; break; } if(grid[i][n]==0 && n==y+1) remove(); } } } } } } } public void linePassOne()if (y0>j)for (i=y0-1;i>=j ;i-- )if (grid[x0][i]!=0) k=0; break; } else } } if (y0<j)for (i=y0+1;i<=j ;i++)if (grid[x0][i]!=0) k=0; break; } else} } } public void rowPassOne()if (x0>i) for (j=x0-1;j>=i ;j-- ) if (grid[j][y0]!=0) k=0; break; } else } } if (x0<i) for (j=x0+1;j<=i ;j++ ) if (grid[j][y0]!=0) k=0; break; } else } } } public void remove()firstButton.setVisible(false); secondButton.setVisible(false); fraction(); pressInformation=false; k=0; grid[x0][y0]=0; grid[x][y]=0; } public void actionPerformed(ActionEvent e) if(e.getSource()==newlyButton)int grid[][] = new int[8][7]; this.grid = grid; randomBuild(); mainFrame.setVisible(false); pressInformation=false; init(); } if(e.getSource()==exitButton) System.exit(0); if(e.getSource()==resetButton) reload(); for(int cols = 0;cols < 6;cols++)for(int rows = 0;rows < 5;rows++ )if(e.getSource()==diamondsButton[cols][rows]) estimateEven(cols+1,rows+1,diamondsButton[cols][rows]); } } } public static void main(String[] args) lianliankan llk = new lianliankan(); llk.randomBuild(); llk.init(); } } //old 998 lines //new 318 lines停留在HelloWorld的水平这个就比较难了你还是你弄弄数组或者list各种排序问题，比较一下效率（可以数据量大点）或者比如输入两数字比较大小然后计算两数字之间的偶数和之类的吧你好！停留在HelloWorld的水平这个就比较难了你还是你弄弄数组或者list各种排序问题，比较一下效率（可以数据量大点）或者比如输入两数字比较大小然后计算两数字之间的偶数和之类的吧仅代表个人观点，不喜勿喷，谢谢。