Android studio 运行main 函数的方法

标题Gradle构建问题

切换到Project工程下.idea/gradle.xml添加属性
<option name="delegatedBuild" value="false" />

图例

PS：下面通过示例代码看下JAVA中的main函数

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);
 }
}