java 基础

package wo;import java.math.*;import java.lang.*;import java.text.DateFormat;import java.util.*;public class Da {/** * @param args */public static void main(String[] args) throws Exception{// TODO Auto-generated method stubString s="session";char c=s.charAt(1);System.out.println(c);int arr[]=new int[6];//for(int i=0;i<6;i++)//arr[i]=(int)(Math.random()*100);for(int i=0;i<arr.length;i++)System.out.print(arr[i]+"  ");String s1="ahshfk",s2="ieeiieie";s1=s1.concat(s2);int a=s1.indexOf('h');int b=s2.lastIndexOf('i');System.out.println(s1+"  "+a+"   "+b);Da d1=new Da();Da d3=d1;System.out.println(d1.equals(d3));Date date=new Date();System.out.println(date.getHours());DateFormat f=DateFormat.getDateInstance(DateFormat.FULL);String ca=f.format(date);System.out.println(ca);String st="  what  are  your doing  ";int j=0;for(int i=0;i<st.length()-1;i++){if((st.charAt(i)!=' ' && st.charAt(i+1)==' ')){j++;}}System.out.println("有单词"+j+"个");int d[]={3,12,25,4,26,32,89,44};for(int t:d){System.out.print(t+" ");}System.out.println();Arrays.sort(d);for(int t:d){System.out.print(t+" ");}List l=new ArrayList();l.add("php");l.add("java");l.add("jsp");l.add("love");show(l);Collections.sort(l);//show(l);Collections.shuffle(l);//show(l);System.out.println();System.out.println("最大值："+Collections.max(l));System.out.println("最小值："+Collections.min(l));}private static void show(List l){ListIterator lt=l.listIterator();System.out.println();while(lt.hasNext()){System.out.print(lt.next()+"  ");}}}