乱七八糟的备份

package org.lxh.demo16.common;

//import java.awt.List;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;
import java.util.Map;
import java.util.Random;


/**
 * implement file: Tfrk.java
 * desc: 给一个大小为100的（整型）数组，分配0-1000的随机数100个，
 * 但这100个数不能重复，然后把它从小到大排序，并输出来。（时间10分钟）
 * @author hemmingway <[e-mail]>
 *
 */
public class Tfrk {
  //Singleton
  private static Tfrk instance = null;

  //setter & getter
  public static void setInstance(Tfrk instance) {
    Tfrk.instance = instance;
  }

  public static Tfrk getInstance() {
    if (instance == null)
      Tfrk.setInstance(new Tfrk());
    return instance;
  }

  /**
   * @param args
   */
  public static void main(String[] args) {
    // TODO Auto-generated method stub

    //采用插入排序法, 产生一个随机数就插入，插入的过程排除重复数字的插入即可
    Random random = new Random();
    int[] arrayList = new int[101];
    int len;            //动态记录已分配的数组长度
    int j;

    //initialization
    arrayList[0] = Math.abs(random.nextInt() % 1000);
    len = 1;
    while(true) {
      int num= Math.abs(random.nextInt() % 1000); 
      for(j = len-1; j > -1 && num < arrayList[j]; j--) ; 

      //检查重复的数字
      if( (j == -1 ) || ( j > -1 && num > arrayList[j]) ){
        for(int tmp = len-1; tmp > j; tmp-- ){
          arrayList[tmp+1] = arrayList[tmp];
        }
        arrayList[j + 1] = num;
        len++;
      }

      //随机分配100个后，就跳出，不再分配
        if (len > 99)  break;
    } // end while(true)

    //打印输出
    for (int i = 0; i < 100; i++){
         System.out.println( "arrayList[" + i + "]: " + arrayList[i]);
     }

    //what's the error?
    short s1 = 1;
    //s1 = s1 + 1;    //cannot convert from int to short
    s1 = (short) (s1 + 1);
    System.out.println(s1);

    //what's the out put?
    System.out.println(Math.round(11.5) + ", " + Math.round(-11.5));

    //how many String Object?
    @SuppressWarnings("unused")
    String ss = new String("XYZ");

    //JDK 1.7, where is goto syntax?

    //给出一个 runtime exception
    //System.out.println(arrayList[101]);   //java.lang.ArrayIndexOutOfBoundsException: 101

    //接口与抽象类
    //接口可以继承接口。抽象类可以实现(implements)接口，
    //抽象类可继承实体类，但前提是实体类必须有明确的构造函数。

    //容器
    @SuppressWarnings("unused")
    List<String> lst;       //Collection<E>

    //List的实现有ArrayList 和 Vector
    lst = new ArrayList<String>();

    @SuppressWarnings("unused")
    Set<String> set;        //Collection<E>

    @SuppressWarnings("unused")
    Map<String, String> map;    //nothing

    ///
    @SuppressWarnings("unused")
    int ll = arrayList.length;   //数组的length属性

    String str = "some test";

    @SuppressWarnings("unused")
    int sll = str.length();   //String有length方法


    //public final class String
      //implements java.io.Serializable, Comparable<String>, CharSequence

    /
    try{
      @SuppressWarnings("unused")
      short s2 = 3;
      return;
    }catch(Exception e){
      e.printStackTrace();
    }finally{

    }




  }



}