递归和数组排序

public class testN {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
      testN n=new testN();
      double m = n.getall(5);
      System.out.println(m);
}
    public double getall(int a){
    if(a==1) return 1;
    else
    return a*getall(a-1);
    }
/*public static void main(String [] args){
String[] name={"4","7","7","2","1"};
System.out.println("The Original order:");
for(int i=0;i<name.length;i++)
{
System.out.println(i+":"+name[i]);
}
Arrays.sort(name);
System.out.println("The new order:");
for(int i=0;i<name.length;i++)
{
System.out.println(i+":"+name[i]);
}


}*/

}

引用

public class test {
public static void main(String[] args) {
String s="abcdefga";
/* char[] b=a.toCharArray();
System.out.println(b[0]);
StringBuffer buf=new StringBuffer();
for (int j = b.length-1; j>-1 ; j--) {
buf.append(b[j]);

}
System.out.println(buf.toString());
System.out.println("aaa");*/

  StringBuffer sb=new StringBuffer();
    for(int i=s.length()-1;i>=0;i--)
    {
      sb.append(s.charAt(i));
    }
    System.out.println(sb.toString());

/* char []cc = s.toCharArray();
     char []temp = new char[cc.length];
    for(int i=0,j=c.length-1;i<c.length;i++,j--){
      temp[j]=c[i];
    }
     System.out.println(temp);
 
       char[]c=s.toCharArray();
       for(int i=0,j=c.length-1;i<c.length;i++,j--){
       temp[j]=c[i];
       }
       System.out.println(temp);*/
}

}