在 Java ,containsValue()方法的TreeMap 类用于检查特定值是否被 TreeMap 中的任何键映射。它将该值作为参数,如果该值由映射中的任何键映射,则返回 True。
--> java.util Package --> TreeMap class --> containsValue() Method
用法:
Tree_Map.containsValue(Object Value)
参数:的v阿卢埃对象类型,指的是映射中的任何键都应该检查其映射的值。 (只有一个参数)
返回类型:布尔值,如果检测到值的映射则为 true,否则为 false。
Note: In java, while returning boolean values are returned as true false only not as 0 and 1 as it is not allowed so do will throw error at compilation.
示例 1:将字符串值映射到整数键。
Java
// Java Program to Illustrate containsValue() Method
// of TreeMap class
// Importing required classes
import java.util.*;
// Main class
public class GFG {
// main driver method
public static void main(String[] args)
{
// Creating an empty TreeMap by
// declaring object of integer and string pairs
TreeMap<Integer, String> tree_map
= new TreeMap<Integer, String>();
// Mapping string values to int keys
// using put() method
tree_map.put(10, "Geeks");
tree_map.put(15, "4");
tree_map.put(20, "Geeks");
tree_map.put(25, "Welcomes");
tree_map.put(30, "You");
// Printing the elements of TreeMap
System.out.println("Initial Mappings are: "
+ tree_map);
// Checking for custom value in map
// using containsValue() method
// Say for the Value 'Geeks'
System.out.println(
"Is the value 'Geeks' present? "
+ tree_map.containsValue("Geeks"));
// Checking for the Value 'World'
System.out.println(
"Is the value 'World' present? "
+ tree_map.containsValue("World"));
}
}
输出
Initial Mappings are: {10=Geeks, 15=4, 20=Geeks, 25=Welcomes, 30=You} Is the value 'Geeks' present? true Is the value 'World' present? false
示例 2:将整数值映射到字符串键。
Java
// Java Program to illustrate containsValue() Method
// of TreeMap class
// Importing required classes
import java.util.*;
// Main class
public class GFG {
// Main driver method
public static void main(String[] args)
{
// Creating an empty TreeMap by
// declaring object of string, integer pairs
TreeMap<String, Integer> tree_map
= new TreeMap<String, Integer>();
// Mapping int values to string keys
// using put() method
tree_map.put("Geeks", 10);
tree_map.put("4", 15);
tree_map.put("Geeks", 20);
tree_map.put("Welcomes", 25);
hastree_map_map.put("You", 30);
// Printing the elements of TreeMap
System.out.println("Initial Mappings are: "
+ tree_map);
// Checking for the Value '10'
// using containsValue() method
System.out.println("Is the value '10' present? "
+ tree_map.containsValue(10));
// Checking for the Value '30'
System.out.println("Is the value '30' present? "
+ tree_map.containsValue(30));
// Checking for the Value '40'
System.out.println("Is the value '40' present? "
+ tree_map.containsValue(40));
}
}
输出:
Note: Similarly the same operation can be performed with any type of Mappings with variation and combination of different data types.
相关用法
- Java TreeMap containsValue()用法及代码示例
- Java TreeMap containsKey()用法及代码示例
- Java TreeMap comparator()用法及代码示例
- Java TreeMap ceilingEntry()用法及代码示例
- Java TreeMap ceilingKey()用法及代码示例
- Java TreeMap clear()用法及代码示例
- Java TreeMap clone()用法及代码示例
- Java TreeMap ceilingEntry()、ceilingKey()用法及代码示例
- Java TreeMap firstKey()用法及代码示例
- Java TreeMap pollFirstEntry()用法及代码示例
- Java TreeMap pollLastEntry()用法及代码示例
- Java TreeMap entrySet()用法及代码示例
- Java TreeMap floorKey()用法及代码示例
- Java TreeMap get()用法及代码示例
- Java TreeMap headMap()用法及代码示例
- Java TreeMap higherEntry()用法及代码示例
- Java TreeMap higherKey()用法及代码示例
- Java TreeMap keySet()用法及代码示例
- Java TreeMap lastKey()用法及代码示例
- Java TreeMap lowerEntry()用法及代码示例
- Java TreeMap lowerKey()用法及代码示例
- Java TreeMap navigableKeySet()用法及代码示例
- Java TreeMap put()用法及代码示例
- Java TreeMap putAll()用法及代码示例
- Java TreeMap remove()用法及代码示例
注:本文由纯净天空筛选整理自Chinmoy Lenka大神的英文原创作品 TreeMap containsValue() 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。