java属性setproperty（）方法与示例 -金沙1005

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);

为防止网络爬虫，请关注公众号回复”口令”

激活idea 激活clion

datagrip dataspell

dotcover dotmemory

dottrace goland

phpstorm pycharm

resharper reshac

rider rubymine

webstorm 全家桶

解锁下载

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: