Java SimpleBindings put()用法及代码示例

SimpleBindings类的put()方法用于在SimpleBindings对象中添加指定的键和值对。键和值都作为参数传递。将键重命名为要在SimpleBindings对象中设置的值的名称。设置value方法后，将返回指定键的先前值，如果先前未设置键，则它将返回null。

Synatx：

public Object put(String name, Object value)

参数：此方法接受两个参数：

name这是值的名称和
value这是要设置的值。

返回值：此方法返回指定键的先前值，如果先前未设置键，则此方法将返回null。

异常：此方法引发以下异常：

NullPointerException ：如果指定的名称为null
IllegalArgumentException：如果指定的名称为空String

Java程序来说明put()方法的用法：

程序1:

// Java program to demosntrate get() method 
  
import javax.script.SimpleBindings; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // Create simpleBindings object 
        SimpleBindings bindings 
            = new SimpleBindings(); 
  
        // Add key value pair using put() 
        bindings.put("key1", "value1"); 
        bindings.put("key2", "value2"); 
        bindings.put("key3", "value3"); 
  
        // Print them 
        System.out.println("Key1:"
                           + bindings.get("key1")); 
        System.out.println("Key2:"
                           + bindings.get("key2")); 
        System.out.println("Key3:"
                           + bindings.get("key3")); 
    } 
}

输出：

Key1:value1
Key2:value2
Key3:value3

程序2:

// Java program to demosntrate get() method 
  
import javax.script.SimpleBindings; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // Create simpleBindings object 
        SimpleBindings asiaTeamList 
            = new SimpleBindings(); 
  
        // Add team in asiaTeamList using put() 
        asiaTeamList.put("team1", "India"); 
        asiaTeamList.put("team2", "Sri Lanka"); 
        asiaTeamList.put("team3", "Pakistan"); 
        asiaTeamList.put("team4", "Bangladesh"); 
  
        // Print 
        System.out.println( 
            asiaTeamList.get("team1")); 
        System.out.println( 
            asiaTeamList.get("team2")); 
        System.out.println( 
            asiaTeamList.get("team3")); 
        System.out.println( 
            asiaTeamList.get("team4")); 
    } 
}

输出：

India
Sri Lanka
Pakistan
Bangladesh

参考文献： https://docs.oracle.com/javase/10/docs/api/javax/script/SimpleBindings.html#put(java.lang.String, java.lang.Object)

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注：本文由纯净天空筛选整理自AmanSingh2210大神的英文原创作品 SimpleBindings put() 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。