Java 中的属性列表(PrintWriter)方法，示例
原文:https://www . geesforgeks . org/properties-listprintwister-method-in-Java-with-examples/
属性类 的列表(PrintWriter) 方法用于将该属性列表打印到指定的输出流中，作为参数传递。此方法可用于调试目的，因为它有助于查看流中的属性元素。0
语法:
public void list(PrintWriter out)
参数:该方法接受一个参数 PrintWriter out ，该参数是要在其上打印属性元素的输出流。
返回:这个方法只是打印元素，不返回任何东西。
异常:如果该属性列表中的任意键不是字符串，则该方法抛出 ClassCastException 。
下面的程序展示了 int list(PrintWriter)方法的实现。
程序 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
程序二:
// 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
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