Java 中属性 getProperty(key)方法示例
原文:https://www . geesforgeks . org/properties-getpropertykey-method-in-Java-with-examples/
属性类 的获取属性(键)方法用于获取映射到该键的值，作为参数传递到该属性对象中。此方法将获取该键的相应值(如果存在)，并返回它。如果没有这样的映射，则返回 null。
语法:
public Object getProperty(String key)
参数:该方法接受一个参数键，其映射将在该属性对象中检查。
返回:该方法返回与该键对应的值(如果存在)。如果没有这样的映射，则返回 null。
下面的程序说明了 getProperty(key)方法:
程序 1:
// Java program to demonstrate
// getProperty(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
.getProperty("Pen"));
// Getting the value of Phone
System.out.println("Value of Phone: "
+ properties
.getProperty("Phone"));
}
}
输出:
Properties: {Book=500, Mobile=5000, Pen=10, Clothes=400}
Value of Pen: null
Value of Phone: null
程序二:
// Java program to demonstrate
// getProperty(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
.getProperty("1"));
// Getting the value of 5
System.out.println("Value of 5: "
+ properties
.getProperty("5"));
}
}
输出:
Current Properties: {3=1000RS, 2=500RS, 1=100RS}
Value of 1: null
Value of 5: null
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