Java Properties list(PrintWriter)用法及代碼示例

Properties類的list(PrintWriter)方法用於將此Properties列表打印到指定的輸出流，並作為參數傳遞。該方法可用於調試目的，因為它有助於查看stream.0上的Properties元素。

用法:

public void list(PrintWriter out)

參數：此方法接受參數PrintWriter out，該參數是要在其上打印Properties元素的輸出流。

返回值：此方法僅打印元素，不返回任何內容。

異常：如果此屬性列表中的任何鍵不是字符串，則此方法將引發ClassCastException。

下麵的程序顯示了int list(PrintWriter)方法的實現。

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(); 
    } 
}

輸出：

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(); 
    } 
}

輸出：

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

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

相關用法

注：本文由純淨天空篩選整理自Kirti_Mangal大神的英文原創作品 Properties list(PrintWriter) method in Java with Examples。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。