JAVA PROGRAM • LEVEL 17 — DATA STRUCTURES & ALGORITHMS IN JAVA
Implement Stack Operations in Java
Learn implement stack operations in java with a complete, compiler-ready Java 17 example.
PROBLEM UNDERSTANDING
Input and expected output
No input required
30 20
COMPLETE JAVA 17 PROGRAM
Complete Java 17 implementation
import java.util.*;class Main{public static void main(String[] args){Deque<Integer> stack=new ArrayDeque<>();stack.push(10);stack.push(20);stack.push(30);System.out.println(stack.pop()+" "+stack.peek());}}CURRENT STEP
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SELECTED LINE
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EXPECTED OUTPUT FOR THE SAMPLE
30 20
PROGRAM EXPLANATION
Algorithm and explanation
- Initialize the deterministic sample values used for implement stack operations in java.
- Create the required object and apply Stack and ArrayDeque to its state or behavior.
- Print the final result and compare it with the documented sample output.
This Java 17 example demonstrates Stack and ArrayDeque through a complete, executable program. The values are intentionally small so students can trace each statement, verify the output, and then modify the example safely in the online compiler.
EFFICIENCY
Time and space complexity
O(1)
O(n)
DEBUGGING CHECKLIST
Common mistakes
Keep the class name Main and the entry method signature public static void main(String[] args) when using the online compiler.
Use Stack with compatible Java types; Java checks types and method signatures at compile time.
Java is case-sensitive, and every statement that requires a semicolon must end with one.