明明代码输入正确但却又跑不了（很简单的代码）

Question

package com.hann.studycore;

public class a911 {
    int[] arr1 = new int[2];
     arr1 [0]= 1;
     arr1 [1]= 2;
    for (int i = 0;i< arr1.length;i++){
        System.out.println(arr1[i]);}
    }

Answer 1

要把执行的代码写在main方法内，main是程序的入口方法，这样写就可以了

 
package com.hann.studycore;
public class a911 {
  public static void main(String[] args) {
      int[] arr1 = new int[2];
      arr1 [0]= 1;
      arr1 [1]= 2;
      for (int i = 0;i< arr1.length;i++){
        System.out.println(arr1[i]);}
    }
  }
}