public boolean addNewUser(String[] user, int file) { StringBuffer userOneString = new StringBuffer(); this.readin(userManager.userFile[file - 1]); this.userList.add(user); for (String[] userOneArray : userList) { for (String userOne : userOneArray) { userOneString.append(userOne + ";"); } userOneString.append("\n"); } //stream流 ByteArrayInputStream stream = new ByteArrayInputStream(userOneString .toString().getBytes()); try { OutputStream os = new FileOutputStream( userManager.userFile[file - 1]); int bytesRead = 0; byte[] buffer = new byte[8192]; while ((bytesRead = stream.read(buffer, 0, 8192)) != -1) { os.write(buffer, 0, bytesRead); } os.close(); stream.close(); userList = null; } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return true; }
时间: 2024-03-28 17:37:30 浏览: 24
这段代码看起来是一个Java方法,它的作用是将一个新用户添加到用户列表中,并将用户列表写入到文件中。具体来说,它接收两个参数:一个是包含新用户信息的字符串数组,另一个是一个整数,表示要将用户添加到哪个文件中。然后,它首先读取指定文件中的用户列表,将新用户添加到列表中,然后使用流将更新后的用户列表写入到文件中。最后,它返回一个布尔值,表示用户添加是否成功。
相关问题
public Animal(String name, int age) { this.name = name; this.age = age; }这不是提供了吗
是的,你说得对,我之前的回答有些模糊。在这个例子中,父类 `Animal` 已经提供了带有参数的构造函数 `Animal(String name, int age)` 来初始化属性,因此在子类 `Cat` 和 `Dog` 中可以使用 `super(name, age)` 来调用父类的构造函数,以初始化继承自父类的属性 `name` 和 `age`。
在这种情况下,子类的构造函数中可以不写 `super(name, age)`,编译器会自动调用父类的带有参数的构造函数,但是建议在子类的构造函数中显式地调用父类的构造函数,以提高代码的可读性和可维护性。
因此,以下是更新后的代码示例:
```java
public class Animal {
private String name;
private int age;
public Animal(String name, int age) {
this.name = name;
this.age = age;
}
public void eat() {
System.out.println("The animal is eating.");
}
public void sleep() {
System.out.println("The animal is sleeping.");
}
}
public class Cat extends Animal {
private boolean isIndoor;
public Cat(String name, int age, boolean isIndoor) {
super(name, age);
this.isIndoor = isIndoor;
}
public void meow() {
System.out.println("The cat is meowing.");
}
@Override
public void eat() {
System.out.println("The cat is eating fish.");
}
}
public class Dog extends Animal {
private String breed;
public Dog(String name, int age, String breed) {
super(name, age);
this.breed = breed;
}
public void bark() {
System.out.println("The dog is barking.");
}
@Override
public void eat() {
System.out.println("The dog is eating meat.");
}
}
```
package dao; public class Book { private int id; private String title; private String author; private boolean issued; private String borrower; public Book(int id, String title, String author, boolean issued, String borrower) { this.id = id; this.title = title; this.author = author; this.issued = issued; this.borrower = borrower; } public int getId() { return id; } public String getTitle() { return title; } // Getters and setters for other properties public String getAuthor() { return author; } public boolean isIssued() { return issued; } public String getBorrower() { return borrower; } public void setId(int id) { this.id = id; } public void setTitle(String title) { this.title = title; } // Setters for other properties public void setAuthor(String author) { this.author = author; } public void setIssued(boolean issued) { this.issued = issued; } public void setBorrower(String borrower) { this.borrower = borrower; } }
这是一个 Java 类的代码,名为 Book,它有五个属性:id、title、author、issued 和 borrower。其中 id 是 int 类型,title、author 和 borrower 是 String 类型,issued 是 boolean 类型。这个类有一个构造方法,可以传入 id、title、author、issued 和 borrower,然后将这些参数赋值给对象的属性。还有一些 getter 和 setter 方法,可以获取和设置对象的属性。这个类可能是用来表示图书的,因为它有 id、title、author 和 borrower 这几个属性,可以记录一本书的基本信息和借阅情况。