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 {//Singletonprivate static Tfrk instance = null;//setter & getterpublic 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;//initializationarrayList[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 shorts1 = (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 Vectorlst = 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{}}}