java - 私有(private)构造函数干扰公共(public)方法测试

Question

为什么不能正确编译？我添加了 main 方法行试图测试它，但我收到了很多错误，除了说它们不是语句之外，还说私有(private)构造函数是表达式的非法开头，以及公共(public)构造函数。它还要求我在我认为不必要的地方添加分号，因为它们是方法的开头。我不希望有人为我重新输入代码，但有人至少能指出我正确的方向并告诉我哪里出错了吗？

import java.util.Arrays 
public class Book{
    public static void main (String[] args) {



    private String title;           
    private String authors[];       


    public Book() {
        title = "Test";     
        authors = null;             
    }

    public Book(String title, String[] authors) {   
        this.title = title;
        this.authors = authors;     
    }
    public String getterTitle() {       
        return title;
    }
    public void setterTitle(String title) { 
        this.title = title;
    }
    public String[] getterAuthors() {       
        return authors; 
    }
    public void setterAuthors(String[] authors) {       
        this.authors = authors;
    }
    public String bookToString() {
        return "" + getterTitle() + " by " + getterAuthors() + "";
    }
}

Answer 1

您在 java.util.Arrays 之后缺少分号，并且您的 main 没有结束 } 大括号:

import java.util.Arrays;

public class Book {
    private String title;           
    private String authors[];

    public Book(String title, String[] authors) {   
        this.title = title;
        this.authors = authors;     
    }

    public String getterTitle() {       
        return title;
    }

    public void setterTitle(String title) { 
        this.title = title;
    }

    public String[] getterAuthors() {       
        return authors; 
    }

    public void setterAuthors(String[] authors) {       
        this.authors = authors;
    }

    public String bookToString() {
        return "" + getterTitle() + " by " + getterAuthors() + "";
    }

    public static void main (String[] args) {
         // Do something here
    }
}