Java属性setProperty()方法与示例[亲测有效]

Java属性setProperty()方法与示例[亲测有效]属性类setProperty()方法(PropertiesClasssetProperty()method)setProperty()methodisavailableinjava.utilpackage.setProperty()方法在java.util包中可用。setProperty()methodisusedtosetthegivenvaluee…

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属性类setProperty()方法 (Properties Class setProperty() method)

  • setProperty() method is available in java.util package.

    setProperty()方法在java.util包中可用。

  • setProperty() method is used to set the given value element (val_ele) associated with the given key element (key_ele) when no value element associate previously otherwise it replaces the old value with the given value for the given key of this Properties.

    setProperty()方法用于设置与给定键元素(key_ele)关联的给定值元素(val_ele),前提是之前没有关联的值元素,否则它将用此属性的给定键的给定值替换旧值。

  • setProperty() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.

    setProperty()方法是一个非静态方法,只能通过类对象访问,如果尝试使用类名称访问该方法,则会收到错误消息。

  • setProperty() method does not throw an exception at the time of setting the property.

    setProperty()方法在设置属性时不会引发异常。

Syntax:

句法:

    public Object setProperty(String key_ele, String val_ele);

Parameter(s):

参数:

  • String key_ele – represents the key element at which the value is to be set.

    字符串key_ele –表示要在其上设置值的键元素。

  • String val_ele – represents the value element for the given key.

    字符串val_ele –表示给定键的value元素。

Return value:

返回值:

The return type of the method is Object, it returns the old value linked with the given key if exists otherwise it returns null.

方法的返回类型为Object ,如果存在则返回与给定键链接的旧值,否则返回null。

Example:

例:

// Java program to demonstrate the example 
// of Object setProperty(String key_ele, String val_ele)
// method of Properties

import java.io.*;
import java.util.*;

public class SetPropertyOfProperties {
   
   
 public static void main(String arg[]) throws Exception {
   
   
  // Instantiate Properties object
  Properties prop = new Properties();

  prop.put("10", "C");
  prop.put("20", "C++");
  prop.put("30", "JAVA");
  prop.put("40", "PHP");
  prop.put("50", "SFDC");

  // By using setProperty() method is to
  // replace the old value for the given
  // key if exists with the given new value
  Object ob = prop.setProperty("20", "OOPS");

  // Display old value returned for the
  // given key element
  System.out.println("prop.setProperty(20,OOPS): " + ob);

  // Display updated list
  prop.list(System.out);
 }
}

Output

输出量

prop.setProperty(20,OOPS): C++
-- listing properties --
50=SFDC
40=PHP
30=JAVA
20=OOPS
10=C


翻译自: https://www.includehelp.com/java/properties-setproperty-method-with-example.aspx

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