Java两个乒乓球队比赛名单问题(判断素数)

importjava.util.ArrayList;

publicclasspingpang {

  String a,b,c;

  publicstaticvoidmain(String[] args) {

  String[] op = {"x","y","z"};

  ArrayListarrayList=newArrayList();

  for(inti =0; i<3; i++)

  for(intj =0; j<3; j++)

  for(intk =0; k<3; k++) {

  pingpang a=newpingpang(op[i],op[j],op[k]);

   if(!a.a.equals(a.b)&&!a.b.equals(a.c)&&!a.a.equals("x")

   &&!a.c.equals("x")&&!a.c.equals("z")){

   arrayList.add(a);

   }

  }

  for(Object a:arrayList){

  System.out.println(a);

  }

  }

  publicpingpang(String a, String b, String c) {

  super();

  this.a = a;

  this.b = b;

  this.c = c;

  }

  @Override

  publicString toString() {

  // TODO Auto-generated method stub

  return"a的对手是"+a+","+"b的对手是"+b+","+"c的对手是"+c+"n";

  }

}