Android studio 运行main 函数的方法

package com.han;

public class HanTest {
 public static void main(String[] args){
 if(args==null){
  throw new NullPointerException(\"The input is \\\"null\\\"\");
 }else if((args.length!=1&&args.length!=2)){
  Throwable cause=new Throwable(\"You have to input 1 or 2 String arguments\");
  throw new IllegalArgumentException(\"Wrong numbers of args\",cause);
  //throw new IllegalArgumentException(\"Wrong numbers of args\");
 }else if(args.length==1){
  System.out.println(args[0]);
 }else if(args.length==2){
  System.out.println(args[0]);
  System.out.println(args[1]);
 }
 }
}
package com.han;
public class HanTest2 {
 public static void main(String[] args){
 String[] input={\"han\"};
 //HanTest.main(null);
 HanTest.main(input);
 }
}