import java.util.ArrayList;
import java.util.Random;

/**
 * 使用ArrayList实现
 * @Description:

 * @File: Demo.java

 * @Package None

 * @Author Hanyonglu

 * @Date 2012-10-18 下午06:16:55

 * @Version V1.0
 */
public class Demo {
  public static void main(String[] args) {
    Object[] values = new Object[20];
    Random random = new Random();
    ArrayList<Integer> list = new ArrayList<Integer>();

    for(int i = 0; i < values.length;i++){
      int number = random.nextInt(100) + 1;
      
      if(!list.contains(number)){
        list.add(number);
      }
    }
    
    values = list.toArray();
    
    // 遍历数组并打印数据
    for(int i = 0;i < values.length;i++){
      System.out.print(values[i] + "t");
      
      if(( i + 1 ) % 10 == 0){
        System.out.println("n");
      }
    }
  }
}

import java.util.Random;

/**
 * 使用数组实现
 * @Description:

 * @File: Demo4.java

 * @Package None

 * @Author Hanyonglu

 * @Date 2012-10-18 下午06:27:38

 * @Version V1.0
 */
public class Demo4 {
  public static void main(String[] args) {
    int[] values = new int[20];
    Random random = new Random();
    
    for(int i = 0;i < values.length;i++){
      int number = random.nextInt(100) + 1;
      
      for(int j = 0;j <= i;j++){
        if(number != values[j]){
          values[i]=number;
        }               
      }
    }
    
    // 遍历数组并打印数据
    for(int i = 0;i < values.length;i++){
      System.out.print(values[i] + "t");
      
      if(( i + 1 ) % 10 == 0){
        System.out.println("n");
      }
    }
  }
}

import java.util.HashMap;
import java.util.Iterator;
import java.util.Random;
import java.util.Map.Entry;

/**
 * 使用HashMap实现
 * @Description:

 * @File: Demo.java

 * @Package None

 * @Author Hanyonglu

 * @Date 2012-10-18 下午06:12:50

 * @Version V1.0
 */
public class Demo {
  public static void main(String[] args) {
    int n = 0;
    Object[] values = new Object[20];
    
    Random random = new Random();
    HashMap<Object, Object> hashMap = new HashMap<Object, Object>();
    
    // 生成随机数字并存入HashMap
    for(int i = 0;i < values.length;i++){
      int number = random.nextInt(100) + 1;
      hashMap.put(number, i);
    }
    
    // 从HashMap导入数组
    values = hashMap.keySet().toArray();
    
    // 遍历数组并打印数据
    for(int i = 0;i < values.length;i++){
      System.out.print(values[i] + "t");
      
      if(( i + 1 ) % 10 == 0){
        System.out.println("n");
      }
    }
    
//    Iterator iter = hashMap.entrySet().iterator();
//    // 遍历HashMap
//    while (iter.hasNext()) {
//      Entry<Integer, Integer> entry = (Entry)iter.next();
//      int key = entry.getKey();
//      n++;
//      
//      System.out.print(key + "t");
//      
//      if(n % 10 == 0){
//        System.out.println("n");
//      }
//    }
  }
}

import java.util.HashSet;
import java.util.Random;

/**
 * 使用HashSet实现
 * @Description:

 * @File: Test.java

 * @Package None

 * @Author Hanyonglu

 * @Date 2012-10-18 下午06:11:41

 * @Version V1.0
 */
public class Test {
  public static void main(String[] args) {
    Random random = new Random();
    Object[] values = new Object[20];
    HashSet<Integer> hashSet = new HashSet<Integer>();
    
    // 生成随机数字并存入HashSet
    for(int i = 0;i < values.length;i++){
      int number = random.nextInt(100) + 1;
      hashSet.add(number);
    }
    
    values = hashSet.toArray();
    
    // 遍历数组并打印数据
    for(int i = 0;i < values.length;i++){
      System.out.print(values[i] + "t");
      
      if(( i + 1 ) % 10 == 0){
        System.out.println("n");
      }
    }
  }
}

import java.util.HashSet;
import java.util.Random;

/**
 * 使用HashSet实现
 * @Description:

 * @File: Test.java

 * @Package None

 * @Author Hanyonglu

 * @Date 2012-10-18 下午05:11:41

 * @Version V1.0
 */
public class Test {
  public static void main(String[] args) {
    Random random = new Random();
    Object[] values = new Object[20];
    HashSet<Integer> hashSet = new HashSet<Integer>();
    
    // 生成随机数字并存入HashSet
    while(hashSet.size() < values.length){
      hashSet.add(random.nextInt(100) + 1);
    }
    
    values = hashSet.toArray();
    
    // 遍历数组并打印数据
    for(int i = 0;i < values.length;i++){
      System.out.print(values[i] + "t");
      
      if(( i + 1 ) % 10 == 0){
        System.out.println("n");
      }
    }
  }
}

import java.util.Random;

/**
 * 随机调换位置实现
 * @Description:

 * @File: Demo4.java

 * @Package None

 * @Author Hanyonglu

 * @Date 2012-10-18 下午06:54:06

 * @Version V1.0
 */
public class Demo4 {
  public static void main(String[] args) {
    int values[] = new int[100];  
    int temp1,temp2,temp3;  
    Random r = new Random();  
    
    for(int i = 0;i < values.length;i++){
      values[i] = i + 1;
    }
    
    //随机交换values.length次  
    for(int i = 0;i < values.length;i++){  
      temp1 = Math.abs(r.nextInt()) % (values.length-1); //随机产生一个位置  
      temp2 = Math.abs(r.nextInt()) % (values.length-1); //随机产生另一个位置  
      
      if(temp1 != temp2){
        temp3 = values[temp1];  
        values[temp1] = values[temp2];  
        values[temp2] = temp3;
      } 
    }  
    
    // 遍历数组并打印数据
    for(int i = 0;i < 20;i++){
      System.out.print(values[i] + "t");
      
      if(( i + 1 ) % 10 == 0){
        System.out.println("n");
      }
    }
  }
}