Question

为什么这个编译不正确？我添加了main方法行来尝试对其进行测试，但是我遇到了很多错误，说私有构造函数以及公共表达式都是非法的表达式，除了说它们不是语句之外。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始。我不希望有人为我重新输入代码，但有人可以至少将我指向正确的方向并告诉我我要去哪里了吗？

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

在java.util.Arrays之后您缺少分号，并且您的main没有右括号}：

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
    }
}

Answer 2

我想我明白你的意思。

因此，您想参加2节课。

这是主要的。

TestBook.java

    package testbook;

    public class TestBook {

        public static void main(String[] args) {
            // TODO code application logic here
            Book bookClass = new Book();

        }
    }

这是一堂课。

Book.java

package testbook;

public class Book {

    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 3

import java.util.Arrays; // the semi - colon is missing on this line  
public class Book{
private String title;         
private String authors[]; // to make these variables global you 
                         // need to declare them outside of a method  

public static void main (String[] args) {   
 } // you need to close the method before beginning with others

更正以上内容即可为您修复代码。

私有构造函数干扰了公共方法测试

3 个答案: