向量包含 Java 中的()方法
原文:https://www . geesforgeks . org/vector-contains-method-in-Java/
Java . util . vector . contains()方法用于检查 Vector 中是否存在特定元素。所以基本上它是用来检查一个向量是否包含任何特定的元素。
语法:
Vector.contains(Object element)
参数:该方法取一个强制参数 元素 ，为向量类型。这是需要测试向量中是否存在的元素。
返回值:如果向量中存在元素，该方法返回 真 ，否则返回假。
下面的程序说明了 Java.util.Vector.contains()方法:
程序 1:
// Java code to illustrate contains()
import java.util.*;
public class VectorDemo {
public static void main(String args[])
{
// Creating an empty Vector
Vector<String> vec_tor = new Vector<String>();
// Use add() method to add elements into the Vector
vec_tor.add("Welcome");
vec_tor.add("To");
vec_tor.add("Geeks");
vec_tor.add("4");
vec_tor.add("Geeks");
// Displaying the Vector
System.out.println("Vector: " + vec_tor);
// Check for "Geeks" in the Vector
System.out.println("Does the vector contains 'Geeks'? "
+ vec_tor.contains("Geeks"));
// Check for "4" in the Vector
System.out.println("Does the Vector contains '4'? "
+ vec_tor.contains("4"));
// Check if the Queue contains "No"
System.out.println("Does the Queue contains 'No'? "
+ vec_tor.contains("No"));
}
}
Output:
Vector: [Welcome, To, Geeks, 4, Geeks]
Does the vector contains 'Geeks'? true
Does the Vector contains '4'? true
Does the Queue contains 'No'? false
程序 2:
// Java code to illustrate contains()
import java.util.*;
public class VectorDemo {
public static void main(String args[])
{
// Creating an empty Vector
Vector<Integer> vec_tor = new Vector<Integer>();
// Use add() method to add elements into the Vector
vec_tor.add(10);
vec_tor.add(15);
vec_tor.add(30);
vec_tor.add(20);
vec_tor.add(5);
// Displaying the Vector
System.out.println("Vector: " + vec_tor);
// Check for "Geeks" in the Vector
System.out.println("Does the vector contains 'Geeks'? "
+ vec_tor.contains("Geeks"));
// Check for "4" in the Vector
System.out.println("Does the Vector contains '4'? "
+ vec_tor.contains("4"));
// Check if the vector contains "No"
System.out.println("Does the Vector contains 'No'? "
+ vec_tor.contains("No"));
}
}
Output:
Vector: [10, 15, 30, 20, 5]
Does the vector contains 'Geeks'? false
Does the Vector contains '4'? false
Does the Vector contains 'No'? false
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