suanfa.rar_4 3 2 1

/** * @(#)Permutation.java * * * @author * @version 1.00 2008/10/22 */ package javaTest; import java.util.Scanner; import java.io.*; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; public class Permutation { /** * Creates a new instance of <code>Permutation</code>. */ public static void swap(Object[]a,int i,int j) { Object temp=a[i]; a[i]=a[j]; a[j]=temp; } public static void Permutation(Object[]list,int k,int m) { if(k==m) {for(int i=0;i<=m;i++) System.out.print(list[i]); System.out.println(); } else for(int i=k;i<=m;i++) { swap(list,k,i); Permutation(list,k+1,m); swap(list,k,i); } } /** * @param args the command line arguments */ public static void main(String[] args) { int n=0,m=0; Object list[]; Scanner scan=new Scanner(System.in); System.out.print("input n="); n=scan.nextInt(); list=new Object[n]; BufferedReader br=new BufferedReader(new InputStreamReader(System.in)); for(int i=0;i<n;i++) { try { System.out.print("请输入第"+(i+1)+"个数："); list[i]=Integer.parseInt(br.readLine()); } catch (IOException e) { e.printStackTrace(); } } Permutation(list,0,n-1); } }