Question

这是我当前的代码-

public class TriangleNumGenerator {
  int counter;
  int sides;

  public TriangleNumGenerator(){
    sides = 1;
    counter = 2

  }
  public int nextTri(){
    sides = sides+counter;
    counter = counter+1;
    return sides;

  }

  public void reset(){
    counter = 2;
    sides = 1;
  }
}

Main(){
  TriangleNumGenerator ne = new TriangleNumGenerator();
  System.out.println(ne.nextTri());

}

该代码应该执行的操作是每当调用nextTri时，它将打印“ 1、3、6、10”，依此类推。

但是，该代码似乎根本无法打印任何内容。如何使此类实际运行？

Answer 1

需要做一些更新，我已经在评论中添加了

public class TriangleNumGenerator {
    int counter;
    int sides;

    public TriangleNumGenerator(){
        sides = 1;
        counter = 2;  // forgot ; here**

    }
    public int nextTri(){
        sides = sides+counter;
        counter = counter+1;
        return sides;

    }

    public void reset(){
        counter = 2;
        sides = 1;
    }

    // you forgot main method; it has to be exactly same so that JVM 
    // can find it
    public static void main(String[] args) {
        TriangleNumGenerator ne = new TriangleNumGenerator();
        System.out.println(ne.nextTri());  // forgot () in nextTri
    }
}

这些是语法错误。如果使用任何IDE，则应报告所有这些信息！

如何打印创建的班级？

1 个答案: