Java SimpleBindings get()用法及代码示例

SimpleBindings类的get()方法用于返回此SimpleBindings对象将作为参数传递的键映射到的值。如果SimpleBindings对象不包含此键的映射，则方法返回null。

用法:

public Object get(Object key)

参数：此方法仅接受一个参数key，这是要返回其关联值的key。

返回值：此方法返回此键映射到的值，或者为null。

异常：此方法引发以下异常：

NullPointerException ：如果键为空
ClassCastException：如果键不是字符串
IllegalArgumentException：如果键为空String

Java程序来说明get()方法的用法：

程序1:

// Java program to demonstrate get() method 
  
import javax.script.SimpleBindings; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // create simpleBindings object 
        SimpleBindings bindings 
            = new SimpleBindings(); 
  
        // add some keys with values 
        bindings.put("key1", "value1"); 
        bindings.put("key2", "value2"); 
        bindings.put("key3", "value3"); 
  
        // get value of key3 
        Object value = bindings.get("key3"); 
  
        // print 
        System.out.println("key3 value:"
                           + value); 
    } 
}

输出：

key3 value:value3

程序2:

// Java program to demonstrate 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 
        asiaTeamList.put("team1", "India"); 
        asiaTeamList.put("team2", "Sri Lanka"); 
        asiaTeamList.put("team3", "Pakistan"); 
        asiaTeamList.put("team4", "Bangladesh"); 
  
        // get team1, team2 and team5 values 
        Object team1 = asiaTeamList.get("team1"); 
        Object team2 = asiaTeamList.get("team2"); 
        Object team5 = asiaTeamList.get("team5"); 
  
        // print team names 
        System.out.println("Team1:"
                           + team1); 
        System.out.println("Team2:"
                           + team2); 
        System.out.println("Team5:"
                           + team5); 
    } 
}

输出：

Team1:India
Team2:Sri Lanka
Team5:null

参考文献： https://docs.oracle.com/javase/10/docs/api/javax/script/SimpleBindings.html#get(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 get() 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。