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<!DOCTYPE html>
<!-- MIT License
Copyright (c) 2025-2026 Valentyn Kolesnikov <0009-0003-9608-3364@orcid.org>
-->
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="description" content="Test your Java programming knowledge with 200 expertly crafted quiz questions across 20 categories including OOP, Collections, Streams, Multithreading, and more. Features timed challenges, score tracking, achievements, and detailed explanations for every answer.">
<meta name="keywords" content="Java, quiz, programming, OOP, Collections, Streams, Multithreading, JDBC, Generics, Lambda, coding test">
<meta name="author" content="Valentyn Kolesnikov">
<meta property="og:title" content="Java Quiz — 200 Questions across 20 Categories">
<meta property="og:description" content="Challenge yourself with 200 Java programming questions spanning 20 categories. Track your progress, earn achievements, and master Java concepts.">
<meta property="og:type" content="website">
<meta name="theme-color" content="#f89820">
<title>Java Quiz</title>
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<style>
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
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background: linear-gradient(135deg, #f89820 0%, #5382a1 50%, #0d1117 100%);
min-height: 100vh;
padding: 10px;
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border-radius: 20px;
box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
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}
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margin-bottom: 6px;
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opacity: 0.9;
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@keyframes pulse {
0%, 100% { opacity: 1; }
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.explanation {
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.btn-quit {
padding: 6px 14px;
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background: #6c757d;
color: white;
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height: 180px;
border-radius: 50%;
background: linear-gradient(135deg, #f89820, #5382a1);
margin: 0 auto 25px;
display: flex;
align-items: center;
justify-content: center;
color: white;
box-shadow: 0 10px 30px rgba(248, 152, 32, 0.3);
}
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}
.score-number {
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font-weight: bold;
}
.score-label {
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}
.results-message {
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}
.stat-box {
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.stat-box.correct {
background: #d4edda;
color: #155724;
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.stat-box.wrong {
background: #f8d7da;
color: #721c24;
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.stat-box.time {
background: #e7f1ff;
color: #004085;
}
.stat-box .stat-number {
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font-weight: bold;
}
.stat-box .stat-label {
font-size: 0.85rem;
}
.category-scores {
text-align: left;
max-width: 600px;
margin: 0 auto 25px;
max-height: 300px;
overflow-y: auto;
padding: 16px;
background: #f8f9fa;
border-radius: 10px;
}
.category-score-item {
display: flex;
justify-content: space-between;
align-items: center;
padding: 10px 0;
border-bottom: 1px solid #e0e0e0;
gap: 12px;
}
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border-bottom: none;
}
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flex: 1;
font-weight: 500;
}
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min-width: 70px;
text-align: right;
font-weight: bold;
color: #f89820;
}
.category-score-bar {
width: 100px;
height: 8px;
background: #e0e0e0;
border-radius: 4px;
overflow: hidden;
}
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height: 100%;
background: linear-gradient(90deg, #f89820, #5382a1);
border-radius: 4px;
transition: width 0.3s ease;
}
.start-screen {
text-align: center;
padding: 20px;
}
.start-screen h2 {
color: #333;
margin-bottom: 15px;
}
.start-screen p {
color: #666;
margin-bottom: 25px;
line-height: 1.6;
}
.categories-grid {
display: grid;
grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
gap: 8px;
margin-bottom: 25px;
text-align: left;
}
.category-item {
display: flex;
align-items: center;
padding: 8px 12px;
background: #f8f9fa;
border-radius: 8px;
font-size: 0.9rem;
transition: all 0.3s ease;
}
.category-item:hover {
background: #fff5e6;
transform: translateX(5px);
}
.category-item::before {
content: "☕";
color: #f89820;
font-weight: bold;
margin-right: 10px;
}
.quiz-options {
background: #f8f9fa;
padding: 20px;
border-radius: 15px;
margin-bottom: 25px;
}
.quiz-options h3 {
margin-bottom: 16px;
color: #333;
font-size: 1.1rem;
}
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display: grid;
grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
gap: 16px;
}
.option-group {
margin-bottom: 0;
}
.option-group label {
display: block;
margin-bottom: 6px;
color: #555;
font-weight: 600;
font-size: 0.95rem;
}
.option-group select {
width: 100%;
padding: 10px 12px;
border: 2px solid #e0e0e0;
border-radius: 8px;
font-size: 0.95rem;
cursor: pointer;
background: white;
transition: all 0.3s ease;
}
.option-group select:focus {
outline: none;
border-color: #f89820;
box-shadow: 0 0 0 3px rgba(248, 152, 32, 0.1);
}
.java-logo {
font-size: 4rem;
margin-bottom: 15px;
}
.btn-container-center {
display: flex;
gap: 12px;
justify-content: center;
flex-wrap: wrap;
}
.resume-banner {
background: linear-gradient(135deg, #17a2b8, #138496);
color: white;
padding: 12px 16px;
border-radius: 10px;
margin-bottom: 20px;
display: flex;
align-items: center;
justify-content: space-between;
flex-wrap: wrap;
gap: 12px;
}
.resume-banner .resume-text {
flex: 1;
}
.resume-banner .resume-text strong {
display: block;
font-size: 1rem;
margin-bottom: 4px;
}
.resume-banner .resume-text span {
font-size: 0.85rem;
opacity: 0.9;
}
.resume-banner .resume-buttons {
display: flex;
gap: 10px;
}
.resume-banner .btn-resume {
background: white;
color: #17a2b8;
padding: 8px 20px;
border: none;
border-radius: 5px;
cursor: pointer;
font-weight: 600;
transition: all 0.3s ease;
}
.resume-banner .btn-resume:hover {
transform: translateY(-2px);
box-shadow: 0 3px 10px rgba(0,0,0,0.2);
}
.resume-banner .btn-dismiss {
background: transparent;
color: white;
border: 2px solid white;
padding: 8px 20px;
border-radius: 5px;
cursor: pointer;
font-weight: 600;
transition: all 0.3s ease;
}
.resume-banner .btn-dismiss:hover {
background: rgba(255,255,255,0.1);
}
.quit-btn-container {
margin-top: 16px;
padding-top: 16px;
border-top: 1px solid #e0e0e0;
display: flex;
justify-content: center;
}
/* Visit Awards Styles */
.visit-awards {
background: linear-gradient(135deg, #fff8e1, #ffecb3);
border-radius: 15px;
padding: 16px;
margin-bottom: 25px;
border: 2px solid #ffc107;
}
.visit-awards h3 {
color: #f57c00;
margin-bottom: 12px;
font-size: 1.1rem;
}
.visit-stats {
display: flex;
justify-content: space-around;
flex-wrap: wrap;
gap: 10px;
margin-bottom: 12px;
}
.visit-stat {
text-align: center;
padding: 8px 16px;
background: white;
border-radius: 10px;
box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}
.visit-stat .stat-value {
font-size: 1.6rem;
font-weight: bold;
color: #f89820;
}
.visit-stat .stat-label {
font-size: 0.8rem;
color: #666;
}
.awards-container {
display: flex;
flex-wrap: wrap;
gap: 8px;
justify-content: center;
}
.award-badge {
display: inline-flex;
align-items: center;
gap: 6px;
padding: 6px 12px;
border-radius: 25px;
font-size: 0.85rem;
font-weight: 600;
transition: transform 0.3s ease;
}
.award-badge:hover {
transform: scale(1.05);
}
.award-badge.earned {
background: linear-gradient(135deg, #ffd700, #ffb300);
color: #5d4037;
box-shadow: 0 3px 15px rgba(255, 193, 7, 0.4);
}
.award-badge.locked {
background: #e0e0e0;
color: #9e9e9e;
}
.award-badge .award-icon {
font-size: 1.1rem;
}
.streak-indicator {
background: linear-gradient(135deg, #ff6b6b, #ee5a24);
color: white;
padding: 8px 16px;
border-radius: 10px;
text-align: center;
margin-top: 12px;
}
.streak-indicator.active {
animation: streakPulse 2s infinite;
}
@keyframes streakPulse {
0%, 100% { box-shadow: 0 0 0 0 rgba(255, 107, 107, 0.4); }
50% { box-shadow: 0 0 0 10px rgba(255, 107, 107, 0); }
}
/* Confetti Styles */
.confetti-container {
position: fixed;
top: 0;
left: 0;
width: 100%;
height: 100%;
pointer-events: none;
z-index: 9999;
overflow: hidden;
}
.confetti {
position: absolute;
width: 10px;
height: 10px;
opacity: 0;
}
@keyframes confetti-fall {
0% {
opacity: 1;
transform: translateY(-100px) rotate(0deg);
}
100% {
opacity: 0;
transform: translateY(100vh) rotate(720deg);
}
}
/* Congratulation Popup */
.congrats-popup {
display: none;
position: fixed;
top: 0;
left: 0;
width: 100%;
height: 100%;
background: rgba(0, 0, 0, 0.7);
z-index: 10000;
justify-content: center;
align-items: center;
}
.congrats-popup.show {
display: flex;
animation: fadeIn 0.3s ease;
}
.congrats-content {
background: white;
border-radius: 20px;
padding: 30px;
text-align: center;
max-width: 500px;
margin: 20px;
animation: popIn 0.5s ease;
}
@keyframes popIn {
0% { transform: scale(0.5); opacity: 0; }
50% { transform: scale(1.05); }
100% { transform: scale(1); opacity: 1; }
}
.congrats-icon {
font-size: 4rem;
margin-bottom: 15px;
}
.congrats-title {
font-size: 1.6rem;
color: #f89820;
margin-bottom: 12px;
}
.congrats-message {
font-size: 1rem;
color: #666;
margin-bottom: 20px;
line-height: 1.6;
}
.congrats-awards {
display: flex;
flex-wrap: wrap;
gap: 8px;
justify-content: center;
margin-bottom: 20px;
}
.congrats-btn {
background: linear-gradient(135deg, #f89820, #5382a1);
color: white;
border: none;
padding: 10px 25px;
border-radius: 8px;
font-size: 1rem;
cursor: pointer;
font-weight: 600;
transition: all 0.3s ease;
}
.congrats-btn:hover {
transform: translateY(-2px);
box-shadow: 0 5px 20px rgba(248, 152, 32, 0.4);
}
/* ===== DESKTOP MODE (large screens) ===== */
@media (min-width: 1024px) {
body {
padding: 30px;
}
.quiz-container {
max-width: 960px;
}
.quiz-header {
padding: 35px;
}
.quiz-header h1 {
font-size: 2.5rem;
margin-bottom: 10px;
}
.quiz-header p {
font-size: 1.1rem;
}
.progress-container {
padding: 15px 30px;
}
.progress-text {
font-size: 0.9rem;
}
.quiz-content {
padding: 35px;
}
.start-screen {
padding: 40px;
}
.java-logo {
font-size: 5rem;
margin-bottom: 20px;
}
.start-screen h2 {
font-size: 1.6rem;
margin-bottom: 20px;
}
.start-screen p {
margin-bottom: 30px;
}
.quiz-options {
padding: 25px;
margin-bottom: 30px;
}
.quiz-options h3 {
font-size: 1.2rem;
margin-bottom: 20px;
}
.options-grid {
grid-template-columns: repeat(2, 1fr);
gap: 20px;
}
.option-group select {