求JAVA语言的源代码参考...

1. 求JAVA语言的源代码参考...

每个汉字代表1个数字（1~9）
那i后面参考结果中的0是哪里来的
 
如果是代表0到9的数字我这里写了一个应该算是本方法的方法
 
public static void main(String[] args) {
  String[] sai = {"0","1","2","3","4","5","6","7","8","9"};
  String[] ruan = {"0","1","2","3","4","5","6","7","8","9"};
  String[] jian = {"0","1","2","3","4","5","6","7","8","9"};
  String[] bi = {"0","1","2","3","4","5","6","7","8","9"};
  String[] pin = {"0","1","2","3","4","5","6","7","8","9"};
  
  
  
  for (String saii : sai) {
   for (String ruani : ruan) {
    if(ruani.equals(saii))
     continue;
    
    for (String jiani : jian) {
     if(jiani.equals(ruani) || jiani.equals(saii))
      continue;
      
     for (String bii : bi) {
      if(bii.equals(jiani) || bii.equals(ruani) || bii.equals(saii))
       continue;
      
      for (String pini : pin) {
       if(pini.equals(bii) || pini.equals(jiani) || pini.equals(ruani) || pini.equals(saii)){
        
        continue;
       }
       
       String tmp1=saii+ruani+jiani;
       String tmp2=bii+saii;
       String tmp3=ruani+jiani+bii+pini;
       
       int tmpI1=Integer.parseInt(tmp1);
       int tmpI2=Integer.parseInt(tmp2);
       int tmpI3=Integer.parseInt(tmp3);
       
       int tmpI4=tmpI1*tmpI2;
       if(tmpI4==tmpI3){
        System.out.println(tmp1+"*"+tmp2+"="+tmp3);
       }
      }
     }
    }
   }
  }
 }

2. 求：用JAVA语言编写的银行家算法的源代码

import java.util.*;

class ThreadTest {
  static int type = 4, num = 10; //定义资源数目和线程数目
  static int[] resource = new int[type]; //系统资源总数
  //static int[] copyResource = new int[type]; //副本
  static Random rand = new Random();
  static Bank[] bank = new Bank[num]; //线程组
  Bank temp = new Bank();

  public void init() {
    //初始化组中每个线程，随机填充系统资源总数
    for(int i = 0; i < type; i++)
      resource[i] = rand.nextInt(10) + 80;
    System.out.print("Resource:");
    for(int i = 0; i < type; i++)
      System.out.print(" " + resource[i]);
    System.out.println("");
    for(int i = 0; i < bank.length; i++)
      bank[i] = new Bank("#" + i);
  }
  public ThreadTest4() {
    init();
  }

  class Bank extends Thread {
    //银行家算法避免死锁
    public int[]
      max = new int[type], //总共需求量
      need = new int[type], //尚需资源量
      allocation = new int[type]; //已分配量
    private int[] 
      request = new int[type], //申请资源量
      copyResource = new int[type]; //资源副本
    private boolean isFinish = false; //线程是否完成
    int[][] table = new int[bank.length][type*4]; //二维资源分配表

    private void init() {
      // 随机填充总共、尚需、已分配量
      synchronized(resource) {
        for(int i = 0; i < type; i++) {
          max[i] = rand.nextInt(5) + 10;
          need[i] = rand.nextInt(10);
          allocation[i] = max[i] - need[i];
          resource[i] -= allocation[i]; //从系统资源中减去已分配的
        }
        printer();
        for(int i = 0; i < type; i++) {
          if(resource[i] < 0) {
            //若出现已分配量超出系统资源总数的错误则退出
            System.out.println("The summation of Threads' allocations is out of range!");
            System.exit(1);
          }
        }
      }
    }

    public Bank(String s) {
      setName(s);
      init();
      start();
    }
    public Bank() {
      //none
    }

    public void run() {
      try {
        sleep(rand.nextInt(2000));
      }
      catch(InterruptedException e) {
        throw new RuntimeException(e);
      }
      while(true) {
        //程序没有完成时一直不断申请资源
        if(askFor() == false) {
          try {
            sleep(1000);
          }
          catch(InterruptedException e) {
            throw new RuntimeException(e);
          }
        }
        else
          tryRequest();
        if(noNeed() == true)
          break;
      }
      //休眠一段时间模拟程序运行
      try {
        sleep(1000);
      }
      catch(InterruptedException e) {
        throw new RuntimeException(e);
      }
      System.out.println(getName() + " finish!");
      synchronized(resource) {
        //运行结束释放占有资源
        for(int i = 0; i < type; i++) {
          resource[i] += allocation[i];
          need[i] = allocation[i] = max[i] = 0;
        }
      }
    }

    private void printer() {
      //打印当前资源信息
      System.out.print(getName() + " Max:");
      for(int i = 0; i < type; i++)
        System.out.print(" " + max[i]);
      System.out.print(" Allocation:");
      for(int i = 0; i < type; i++)
        System.out.print(" " + allocation[i]);
      System.out.print(" Need:");
      for(int i = 0; i < type; i++)
        System.out.print(" " + need[i]);
      System.out.print(" Available:");
      for(int i = 0; i < type; i++)
        System.out.print(" " + resource[i]);
      System.out.println("");
    }
    private boolean askFor() {
      //随机产生申请资源量并检测是否超标
      boolean canAsk = false;
      for(int i = 0; i < type; i++) {
        request[i] = rand.nextInt(20);
        //防止申请量超过所需量
        if(request[i] > need[i])
          request[i] = need[i];
      }
      for(int i = 0; i < type; i++) //防止随机申请资源全为0
        if(request[i] > 0)
          canAsk = true;
      synchronized(resource) {
        //锁住可供资源检查是否超标
        for(int i = 0; i < type; i++) {
          if(request[i] > resource[i])
            //如果申请资源超过可供资源则等待一段时间后重新申请
            return false;
        }
      }
      return canAsk;
    }
    private void tryRequest() {
      //创建副本尝试分配请求
      synchronized(resource) {
        for(int i = 0; i < type; i++)
          //依然要防止请求量超出范围
          if(request[i] > resource[i])
            return;
        for(int i = 0; i < type; i++) {
          //复制资源量并减去需求量到一个副本上
          copyResource[i] = resource[i];
          copyResource[i] -= request[i];
        }
        System.out.print(getName() + " ask for:");
        for(int i = 0; i < type; i++)
          System.out.print(" " + request[i]);
        System.out.println("");
        if(checkSafe() == true) {
          //如果检查安全则将副本值赋给资源量并修改占有量和需求量
          for(int i = 0; i < type; i++) {
            resource[i] = copyResource[i];
            allocation[i] += request[i];
            need[i] -= request[i];
          }
          System.out.println(getName() + " request succeed!");
        }
        else
          System.out.println(getName() + " request fail!");
      }
    }
    private boolean checkSafe() {
      //银行家算法检查安全性
      synchronized(bank) {
        //将线程资源信息放入二维资源分配表检查安全性，0~type可用资源／type~type*2所需资源／type*2~type*3占有资源／type*3~-1可用+占用资源
        for(int i = 0; i < bank.length; i++) {
          for(int j = type; j < type*2; j++) {
            table[i][j] = bank[i].need[j%type];
          }
          for(int j = type*2; j < type*3; j++) {
            table[i][j] = bank[i].allocation[j%type];
          }
        }
        //冒泡排序按需求资源从小到大排
        for(int i = 0; i < bank.length; i++) {
          for(int j = i; j < bank.length-1; j++) {
            sort(j, 4);
          }
        }
        //进行此时刻的安全性检查
        for(int i = 0; i < type; i++) {
          table[0][i] = copyResource[i];
          table[0][i+type*3] = table[0][i] + table[0][i+type*2];
          if(table[0][i+type*3] < table[1][i+type])
            return false;
        }
        for(int j = 1; j < bank.length-1; j++) {
          for(int k = 0; k < type; k++) {
            table[j][k] = table[j-1][k+type*3];
            table[j][k+type*3] = table[j][k] + table[j][k+type*2];
            if(table[j][k+type*3] < table[j+1][k+type])
              return false;
          }
        }
      }
      return true;
    }
    private void sort(int j, int k) {
      //递归冒泡排序
      int tempNum;
      if(table[j][k] > table[j+1][k]) {
        for(int i = type; i < type*2; i++) {
          tempNum = table[j][i];
          table[j][i] = table[j+1][i];
          table[j+1][i] = tempNum;
        }
        /*temp = bank[j];
        bank[j] = bank[j+1];
        bank[j+1] = temp;*/
      }
      else if(table[j][k] == table[j+1][k] && k < type*2) //此资源量相同时递归下一个资源量排序并且防止超出范围
        sort(j, k+1);
    }
    private boolean noNeed() {
      //是否还需要资源
      boolean finish = true;
      for(int i = 0; i < type; i++) {
        if(need[i] != 0) {
          finish = false;
          break;
        }
      }
      return finish;
    }
  }

  public static void main(String[] args) {
    ThreadTest t = new ThreadTest();
    //后台线程，设定程序运行多长时间后自动结束
    new Timeout(30000, "---Stop!!!---");
  }
}

3. 如何在java中调用非java语言编写的代码？？

是可以嵌入的。
一般说来都是利用DLL文件的形式去调用的。你首先在JAVA里面写上一段代码。把函数的实现给空出来，然后用C或C++去实现你空出来的那个函数的。然后将C或C++给编译成DLL文件的。然后将DLL文件放到你的工程目录下面，并在JAVA代码中使用LOADLIBRARY()将你写的这个DLL文件包含进去。
基本上就可以实现了。
但是说起来简单但是做起来还是比较复杂的e 。多查查书和网站上的东西吧。。

4. Java语言编程，求代码！！

1.

import java.util.Scanner;

public class Test {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		
		Scanner scanner=new Scanner(System.in);
		
		int a[]= new int[6];
		
		for(int i=0;i<a.length;i++){
			int m=scanner.nextInt();
			a[i]=m;
		}
		int temp;
		for(int i=0;i<a.length;i++){
			for(int j=0;j<a.length-i-1;j++){
				if(a[i]>a[i+1]){
					temp=a[i];
					a[i]=a[i+1];
					a[i+1]=temp;
				}
			}
		}
		
		for(int i=0;i<a.length;i++){
			
		}
		System.out.println("最大值是："+a[a.length-1]+"\t"+"最小值是："+a[0]);

	}

}
2.
package mypackage;

import java.util.Scanner;

public class Student {

	public int id;
	public String name;
	public String sex;
    
	public void init(){
		
		this.id=23;
		this.name="wo";
		this.sex="女";
	}
	
	public void display(){
		
		System.out.println(id);
		System.out.println(name);
		System.out.println(sex);
	}
	
	public String modified(String name){
		
		this.name=name;
		
		return name;
	}
	

}
test类
package test;

import mypackage.Student;

public class StuTest {
	public static void main(String args[]){
		Student t=new Student();
		
		t.init();
		
		t.display();
		
	    t.modified("ni");
	}
}
3.
package test;

import java.util.Scanner;

public class Test {

	public static void main(String args[]){
		
		for(;;){
			System.out.println("请输入考试成绩等级(A-Z 或者 a-z)：如果想要退出请选择0");
			Scanner scanner=new Scanner(System.in);
			String str=scanner.next();
			
			if(str.equals("0")){
				break;
			}
			while(true){
				if(str.length()>1){
					System.out.println("输入的长度过长，请重新输入 ！！！");
					continue;
				}
				else if(str.length()==1){
					char c=str.charAt(0);
					
					int m=c;
					if((m>=65 && m=97&&m<=101)){
						if(str.equals("A")||str.equals("a")){
							System.out.println(str+"所对应的分数段为："+"90分以上");
							break;
						}
						else if(str.equals("B")||str.equals("b")){
							System.out.println(str+"所对应的分数段为："+"80分以上");
							break;
						}
						else if(str.equals("C")||str.equals("c")){
							System.out.println(str+"所对应的分数段为："+"70分以上");
							break;
						}
						else if(str.equals("D")||str.equals("d")){
							System.out.println(str+"所对应的分数段为："+"60分以上");
							break;
						}
						else if(str.equals("E")||str.equals("e")){
							System.out.println(str+"所对应的分数段为："+"59分以下");
							break;
						}
					}
					else {
						System.out.println("输入的不在A-Z或者a-z之间");
						break;
					}
					
				}
				
			}
			
		}
	}

}

5. 请用Java语言来编写一段程序，要求达到如下要求！（请高手给我源代码）

import java.util.Scanner;

public class Sort{
 public static void main(String[] args) {
  Scanner sc = new Scanner(System.in);
  System.out.println("请输入第一个字符：");
  String str1 = sc.next();
  System.out.println("请输入第二个字符：");
  String str2 = sc.next();
  
  char c1 = str1.charAt(0);
  char c2 = str2.charAt(0);
  
  int asc1 = (int)c1;
  int asc2 = (int)c2;
  
  System.out.println("第一个字符" + str1 + "的ascii码是：" + asc1);
  System.out.println("第二个字符" + str2 + "的ascii码是：" + asc2);
  if(asc1 > asc2){
   System.out.println("大的是：" + str1);
  }else{
   System.out.println("大的是：" + str2);
  }
 }
}

6. 求java if语句的调用代码

1.假设有F:\\a.java,和F;\\b.java
2.当输入1的时候，打印出a.java的内容，当输入2的时候出 ，打印出b.java的内容
3.至于读取文件后的操作就随便你了：
public static void main(String[] args) throws IOException {

		while (true) {
			System.out.println("请输入命令：");
			Scanner input = new Scanner(System.in);
			int command = input.nextInt();
			String str = "";
			if (command == 1) {
				FileReader file = new FileReader("F:\\a.java");
				BufferedReader buffer = new BufferedReader(file);
                                                               while((str=buffer.readLine())!=null){
					System.out.println(str);
				}
				continue;
			} else if (command == 2) {
				FileReader file = new FileReader("F:\\b.java");
				BufferedReader buffer = new BufferedReader(file);				while((str=buffer.readLine())!=null){
					System.out.println(str);
				}
				continue;
			}
		}

	}

7. 有关Java语句执行时间（想优化代码）， 求助高手！

图像处理，是用到了文件处理类吗，那么最好一定要缓存类，这样楼主
BufferedInputStream bis=new BufferedInputStream(FileInpuStream)这样,然后再操作用到缓存类速度可以快很多，楼主试试吧，如果实在还是没有提高把你相关的算法再check一下，看是否有性能问题

8. Java语言代码问题

if else 本身没有问题，但是这种写法不是很好。
少了两个大括号 }}
还有哦，把x<=800改成x<=8000。

import java.util.Scanner;
public class CalcDiscount{
 
 
 /**
  * @param args
  */
 public static void main(String[] args) {
  // TODO 自动生成方法存根
  Scanner input = new Scanner(System.in);
  int x = input.nextInt();
  System.out.println("请输入会员积分");
  if (x < 2000){
   System.out.println("该会员享受的折扣是0.9");
  }else{ if (x>=2000 && x<=4000){
   System.out.println("该会员享受的折扣是0.8");
  }else{ if (x>=4000 && x<=8000){
   System.out.println("该会员享受的折扣是0.7");
  }else{
   System.out.println("该会员享受的折扣是0.6");
  }
  }
  }
 }
}