Java Formatter out()方法及示例

out() 方法是 java.util.Formatter 的一个内置方法，用于返回formatter输出的目的地。

语法:

public Appendable out()

参数 ：该函数不接受任何参数。

返回值 ：该函数返回输出的目的地。

异常 ：如果在调用该函数之前，格式化器已经被关闭，该函数会抛出 FormatterClosedException 。

下面是上述函数的实现。

程序 1 :

// Java program to implement
// the above function
  
import java.util.Formatter;
import java.util.Locale;
  
public class Main {
  
    public static void main(String[] args)
    {
  
        // Get the string Buffer
        StringBuffer buffer
            = new StringBuffer();
  
        // Object creation
        Formatter frmt
            = new Formatter(buffer,
                            Locale.CANADA);
  
        // Format a new string
        String name = "My name is Gopal Dave";
        frmt.format("What is your name? \n%s !",
                    name);
  
        // Print the Formatted string
        System.out.println(frmt);
  
        // Prints the destination of the output
        System.out.println("\nDestination: "
                           + frmt.out());
    }
}

输出。

What is your name? 
My name is Gopal Dave !

Destination: What is your name? 
My name is Gopal Dave !

程序2

// Java program to implement
// the above function
  
import java.util.Formatter;
import java.util.Locale;
  
public class Main {
  
    public static void main(String[] args)
    {
        try {
  
            // Get the string Buffer
            StringBuffer buffer
                = new StringBuffer();
  
            // Object creation
            Formatter frmt
                = new Formatter(buffer,
                                Locale.CANADA);
  
            // Format a new string
            String name = "My name is Gopal Dave";
            frmt.format("What is your name? \n%s !",
                        name);
  
            // Print the Formatted string
            System.out.println(frmt);
  
            // Formatter closed
            frmt.close();
  
            // Prints the destination of the output
            System.out.println("\nDestination: "
                               + frmt.out());
        }
        catch (Exception e) {
            System.out.println("Exception is: "
                               + e);
        }
    }
}

输出。

What is your name? 
My name is Gopal Dave !
Exception is: java.util.FormatterClosedException

**参考资料: ** https://docs.oracle.com/javase/10/docs/api/java/util/Formatter.html#out()