Properties类的containsValue(value)方法用于检查此Properties对象是否包含此Value的任何映射。它将此值作为参数进行比较,并返回一个布尔值作为结果。
用法:
public Object containsValue(Object value)
参数:此方法接受参数值,该参数值是要在此属性中搜索的值。
返回值:此方法返回一个布尔值,该布尔值说明结果是否在此Properties对象中存在该结果。
以下示例程序旨在说明containsValue(value)方法:
示例1:
// Java program to demonstrate
// containsValue(value) 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("Current Properties: "
+ properties.toString());
// Check if 10 is present or not
// using containsValue()
System.out.println("Is 10 present: "
+ properties.containsValue(10));
}
}
输出:
Current Properties: {Book=500, Mobile=5000, Pen=10, Clothes=400} Is 10 present: true
示例2:
// Java program to demonstrate
// containsValue(value) 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(1, "100RS");
properties.put(2, "500RS");
properties.put(3, "1000RS");
// print Properties details
System.out.println("Current Properties: "
+ properties.toString());
// Check if 200RS is present or not
// using containsValue()
System.out.println("Is 200RS present: "
+ properties.containsValue("200RS"));
}
}
输出:
Current Properties: {3=1000RS, 2=500RS, 1=100RS} Is 200RS present: false
参考:https://docs.oracle.com/javase/9/docs/api/java/util/Properties.html#containsValue-java.lang.Object-
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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 containsValue(value) 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。