Java Properties isEmpty()用法及代碼示例

Properties類的isEmpty()方法用於檢查此Properties對象是否為空。

用法:

public boolean isEmpty()

參數：此方法不接受任何參數

返回值：此方法返回一個布爾值，說明此Properties對象是否為空。

下麵的程序顯示int isEmpty()方法的實現。

示例1:

// Java code to show the implementation of 
// isEmpty method 
  
import java.util.*; 
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()); 
  
        // Checking if the Properties is empty 
        System.out.println("Is Properties empty: "
                           + properties.isEmpty()); 
    } 
}

輸出：

Properties: {Book=500, Mobile=5000, Pen=10, Clothes=400}
Is Properties empty: false

示例2:

// Java program to demonstrate 
// isEmpty() method. 
  
import java.util.*; 
  
public class GFG { 
  
    // Main method 
    public static void main(String[] args) 
    { 
  
        // Create a properties and add some values 
        Properties properties = new Properties(); 
  
        // Print Properties details 
        System.out.println("Current Properties: "
                           + properties.toString()); 
  
        // Checking if the Properties is empty 
        System.out.println("Is Properties empty: "
                           + properties.isEmpty()); 
    } 
}

輸出：

Current Properties: {}
Is Properties empty: true

參考：https://docs.oracle.com/javase/9/docs/api/java/util/Properties.html#isEmpty–

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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 isEmpty() 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。