Properties类的get(key)方法用于获取映射到此键的值,该键作为参数传递到此Properties对象中。如果存在,此方法将获取与此键对应的值,然后将其返回。如果没有这样的映射,则返回null。
用法:
public Object get(Object key)
参数:此方法接受参数键,该参数键的映射将在此Properties对象中检查。
返回值:如果存在,此方法将返回与此键对应的取值。如果没有这样的映射,则返回null。
以下示例程序旨在说明get(key)方法:
示例1:
// Java program to demonstrate
// get(key) 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());
// Getting the value of Pen
System.out.println("Value of Pen: "
+ properties.get("Pen"));
// Getting the value of Phone
System.out.println("Value of Phone: "
+ properties.get("Phone"));
}
}
输出:
Properties: {Book=500, Mobile=5000, Pen=10, Clothes=400} Value of Pen: 10 Value of Phone: null
示例2:
// Java program to demonstrate
// get(key) 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());
// Getting the value of 1
System.out.println("Value of 1: "
+ properties.get(1));
// Getting the value of 5
System.out.println("Value of 5: "
+ properties.get(5));
}
}
输出:
Current Properties: {3=1000RS, 2=500RS, 1=100RS} Value of 1: 100RS Value of 5: null
参考:https://docs.oracle.com/javase/9/docs/api/java/util/Properties.html#get-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 get(key) 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。