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属性类setProperty()方法 (Properties Class setProperty() method)
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setProperty() method is available in java.util package.
setProperty()方法在java.util包中可用。
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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。
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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。
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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:
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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。
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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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