Properties类的isEmpty()方法用于检查此Properties对象是否为空。
用法:
public boolean isEmpty()
参数:此方法不接受任何参数
返回值:此方法返回一个布尔值,说明此Properties对象是否为空。
下面的程序显示int isEmpty()方法的实现。
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());
}
}
输出:
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());
}
}
输出:
Current Properties: {} Is Properties empty: true
参考:https://docs.oracle.com/javase/9/docs/api/java/util/Properties.html#isEmpty–
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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 isEmpty() 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。