Java PrintWriter println(double)方法及示例

Java中PrintWriter类的println(double)方法用于在流中打印指定的双倍值，然后换行。这个双倍值被作为一个参数。

语法。

public void println(double doubleValue)

参数。此方法接受一个强制性参数doubleValue，它是要写入流中的双倍值。

返回值。该方法不返回任何值。

下面的方法说明了println(double)方法的工作。

程序 1:

// Java program to demonstrate
// PrintWriter println(double) method
  
import java.io.*;
  
class GFG {
    public static void main(String[] args)
    {
  
        try {
  
            // Create a PrintWriter instance
            PrintWriter printr
                = new PrintWriter(System.out);
  
            // Print the double value '4.5'
            // to this stream using println() method
            // This will put the doubleValue in the
            // stream till it is printed on the console
            printr.println(4.5);
  
            printr.flush();
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}

输出:

4.5

程序2。

// Java program to demonstrate
// PrintWriter println(double) method
  
import java.io.*;
  
class GFG {
    public static void main(String[] args)
    {
  
        try {
  
            // Create a PrintWriter instance
            PrintWriter printr
                = new PrintWriter(System.out);
  
            // Print the double value '1.65'
            // to this stream using println() method
            // This will put the doubleValue in the
            // stream till it is printed on the console
            printr.println(1.65);
  
            printr.flush();
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}

输出: