十进制数转为二进制(java实现)

package temptest;
import java.lang.Math;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
public class tobinary {
binary2(int data){
  int b2=data;
  int a2;
  List<Integer> list=new ArrayList<Integer>();//集合用来存每次辗转相除的余数
  while(b2!=0){
   a2=b2%2;
   list.add(a2);
   b2=b2/2;
  }
  for(int j=list.size()-1;j>=0;j--){//最后余数是倒着写的，我们反向遍历集合就可以
   System.out.print(list.get(j));
  }
  System.out.println();
 }
public static void main(String[] args) {
 Scanner scanner = new Scanner(System.in);
 System.out.print("请输入要转换的十进制数:");
 int data=scanner.nextInt();
 tobinary test=new tobinary();
 test.binary2(data);
 scanner.close();
}
}