Java Properties list(PrintWriter)用法及代码示例

Properties类的list(PrintWriter)方法用于将此Properties列表打印到指定的输出流，并作为参数传递。该方法可用于调试目的，因为它有助于查看stream.0上的Properties元素。

用法:

public void list(PrintWriter out)

参数：此方法接受参数PrintWriter out，该参数是要在其上打印Properties元素的输出流。

返回值：此方法仅打印元素，不返回任何内容。

异常：如果此属性列表中的任何键不是字符串，则此方法将引发ClassCastException。

下面的程序显示了int list(PrintWriter)方法的实现。

示例1:

// Java code to show the implementation of 
// list(PrintWriter) method 
  
import java.util.*; 
import java.io.*; 
  
public class GfG { 
  
    // Main method 
    public static void main(String[] args) 
    { 
  
        // Create a properties and add some values 
        Properties properties = new Properties(); 
        properties.put("Pen", "10"); 
        properties.put("Book", "500"); 
        properties.put("Clothes", "400"); 
        properties.put("Mobile", "5000"); 
  
        // Print Properties details 
        System.out.println("Properties: "
                           + properties.toString()); 
  
        PrintWriter writer = new PrintWriter(System.out); 
  
        // print the list with a PrintWriter object 
        properties.list(writer); 
  
        // flush the stream and display 
        System.out.println("listing out the Properties: "); 
        writer.flush(); 
    } 
}

输出：

Properties: {Book=500, Mobile=5000, Pen=10, Clothes=400}
listing out the Properties: 
-- listing properties --
Book=500
Pen=10
Mobile=5000
Clothes=400

示例2:

// Java program to demonstrate 
// list(PrintWriter) method. 
  
import java.util.*; 
import java.io.*; 
  
public class GFG { 
  
    // Main method 
    public static void main(String[] args) 
    { 
  
        // Create a properties and add some values 
        Properties properties = new Properties(); 
  
        // Inserting elements into the properties 
        properties.put("Geeks", "10"); 
        properties.put("4", "15"); 
        properties.put("Geeks", "20"); 
        properties.put("Welcomes", "25"); 
        properties.put("You", "30"); 
  
        // Print Properties details 
        System.out.println("Properties: "
                           + properties.toString()); 
  
        PrintWriter writer = new PrintWriter(System.out); 
  
        // print the list with a PrintWriter object 
        properties.list(writer); 
  
        // flush the stream and display 
        System.out.println("listing out the Properties: "); 
        writer.flush(); 
    } 
}

输出：

Properties: {You=30, Welcomes=25, 4=15, Geeks=20}
listing out the Properties: 
-- listing properties --
You=30
4=15
Welcomes=25
Geeks=20

参考：https://docs.oracle.com/javase/9/docs/api/java/util/Properties.html#list-java.io.PrintWriter-

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注：本文由纯净天空筛选整理自Kirti_Mangal大神的英文原创作品 Properties list(PrintWriter) method in Java with Examples。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。