Java 中的堆栈移除 All()方法，示例
原文:https://www . geesforgeks . org/stack-remove all-in-Java-method-with-example/
Java.util.Stack.removeAll(集合列)方法用于从堆栈中移除指定集合中存在的所有元素。
语法:
Stack.removeAll(Collection col)
参数:该方法接受一个强制参数列，它是要从堆栈中移除其元素的集合。
返回值:此方法返回真如果堆栈因操作而改变，否则假。
异常:如果指定的集合为空，该方法将抛出空指针异常。
下面的程序说明了方法:
程序 1:
// Java code to illustrate removeAll()
import java.util.*;
public class StackDemo {
public static void main(String args[])
{
// Creating an empty Stack
Stack<String> stack = new Stack<String>();
// Use add() method to add elements in the Stack
stack.add("Geeks");
stack.add("for");
stack.add("Geeks");
stack.add("10");
stack.add("20");
// Output the Stack
System.out.println("Stack: " + stack);
// Creating an empty Stack
Stack<String> colstack = new Stack<String>();
// Use add() method to add elements in the Stack
colstack.add("Geeks");
colstack.add("for");
colstack.add("Geeks");
// Remove the head using remove()
boolean changed = stack.removeAll(colstack);
// Print the result
if (changed)
System.out.println("Collection removed");
else
System.out.println("Collection not removed");
// Print the final Stack
System.out.println("Final Stack: " + stack);
}
}
Output:
Stack: [Geeks, for, Geeks, 10, 20]
Collection removed
Final Stack: [10, 20]
程序 2:
// Java code to illustrate removeAll()
import java.util.*;
public class StackDemo {
public static void main(String args[])
{
// Creating an empty Stack
Stack<Integer> stack = new Stack<Integer>();
// Use add() method to add elements in the Stack
stack.add(1);
stack.add(2);
stack.add(3);
stack.add(10);
stack.add(20);
// Output the Stack
System.out.println("Stack: " + stack);
// Creating an empty Stack
Stack<Integer> colstack = new Stack<Integer>();
// Use add() method to add elements in the Stack
colstack.add(30);
colstack.add(40);
colstack.add(50);
// Remove the head using remove()
boolean changed = stack.removeAll(colstack);
// Print the result
if (changed)
System.out.println("Collection removed");
else
System.out.println("Collection not removed");
// Print the final Stack
System.out.println("Final Stack: " + stack);
}
}
Output:
Stack: [1, 2, 3, 10, 20]
Collection not removed
Final Stack: [1, 2, 3, 10, 20]
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