Java中的编写器 equals() 方法和示例

Java中Writer类的Java Java (Object obj)方法用于检查Writer的两个实例是否相等。它返回一个布尔值，说明它们是否相等。

签名：

public boolean equals(Writer second_Writer)

句法：

first_Writer.equals(second_Writer)

参数：此方法接受一个强制参数second_Writer ，它指的是要与第一个 Writer 进行比较的第二个 Writer。

返回值：如果等式成立并且对象和 Writer 都相等，则该方法返回true ，否则返回false 。

以下程序用于说明Java.io.Writer.elements() 方法的工作：

方案一：

// Java code to illustrate the equals() method
  
import java.io.*;
  
public class Writer_Demo {
    public static void main(String[] args)
    {
  
        try {
            // Creating an empty Writer
            Writer writer1 = new PrintWriter(System.out);
  
            // Inserting elements into the Writer
            writer1.write("GeeksForGeeks");
  
            // Displaying the Writer
            System.out.println("Writer 1: "
                               + writer1.toString());
  
            // Creating an empty Writer
            Writer writer2 = new PrintWriter(System.out);
  
            // Inserting elements into the Writer
            writer2.write("GFG");
  
            // Displaying the Writer
            System.out.println("Writer 2: "
                               + writer2.toString());
  
            System.out.println("Are both of them equal? "
                               + writer1.equals(writer2));
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}

输出：

Writer 1: java.io.PrintWriter@232204a1
Writer 2: java.io.PrintWriter@4aa298b7
Are both of them equal? false

方案二：

// Java code to illustrate the equals() method
  
import java.io.*;
  
public class Writer_Demo {
    public static void main(String[] args)
    {
  
        try {
            // Creating an empty Writer
            Writer writer1 = new PrintWriter(System.out);
  
            // Inserting elements into the Writer
            writer1.write("GFG");
  
            // Displaying the Writer
            System.out.println("Writer 1: "
                               + writer1.toString());
  
            // Creating an empty Writer
            Writer writer2 = new PrintWriter(System.out);
  
            // Inserting elements into the Writer
            writer2.write("GFG");
  
            // Displaying the Writer
            System.out.println("Writer 2: "
                               + writer2.toString());
  
            System.out.println("Are both of them equal? "
                               + writer1.equals(writer2));
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}

输出：

Writer 1: java.io.PrintWriter@232204a1
Writer 2: java.io.PrintWriter@4aa298b7
Are both of them equal? false