15位的随机码

public class RandomCode {
	
	public static void main(String[] args) {
    	System.out.println("@@@@@@@@@输出的15位随机码@@@@@@@@@@@@@");
        StringBuffer buf = new StringBuffer("a,b,c,d,e,f,g,h,i,g,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z");
        buf.append(",A,B,C,D,E,F,G,H,I,G,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z");
        buf.append(",~,@,#,$,%,^,&,*,(,),_,+,|,`,.");
        buf.append(",1,2,3,4,5,6,7,8,9,0");
        String[] arr = buf.toString().split(",");
        List pswdList = new ArrayList();
        for(int i=0;i<5;i++){    //输出5个随机码
            pswdList.add(getPswd(arr));
        }
        for(int i=0;i<pswdList.size();i++){
            System.out.println("===="+pswdList.get(i));
        }
    }
    public static String getPswd(String[] arr){
        StringBuffer b = new StringBuffer();
        java.util.Random r;
        int k ;
        for(int i=0;i<15;i++){     //输入出 15位 的随机码
            r = new java.util.Random();
            k = r.nextInt();
            b.append(String.valueOf(arr[Math.abs(k%76)]));
        }
        return b.toString();
    }
}