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JavaRunner
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>JavaRunner — Learn Java Online</title>
<meta name="description" content="JavaRunner: Interactive Java IDE to write, run, and manage Java files locally. Perfect for learners.">
<meta name="author" content="JavaRunner Team">

<link href="https://fonts.googleapis.com/css2?family=Inter:wght@300;400;600;700&display=swap" rel="stylesheet">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.5.0/css/all.min.css">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.65.13/codemirror.min.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.65.13/codemirror.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.65.13/mode/clike/clike.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.65.13/addon/edit/closebrackets.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.65.13/addon/edit/matchbrackets.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.65.13/addon/edit/indentation.min.js"></script>

<style>
:root{
  --bg:#0f1720; --glass:rgba(255,255,255,0.05); --glass-dark:rgba(0,0,0,0.35);
  --accent:#6c8cff; --accent-light:#8be5d0; --muted:#9aa4b2;
  --card-shadow:0 8px 30px rgba(2,6,23,0.6); --radius:16px;
}
*{box-sizing:border-box;}
html, body{margin:0;padding:0;font-family:Inter,sans-serif;background:linear-gradient(180deg,#071227 0%,#0d1a2b 100%);color:#e6eef8;}
body{min-height:100vh;display:flex;flex-direction:column;align-items:center;padding:12px;}

h1,h2,h3,h4,h5,h6{margin:0;}
.app{display:grid;grid-template-columns:280px 1fr;gap:16px;width:100%;max-width:1200px;margin:0 auto;flex:1 1 auto;}
.panel{background:var(--glass);backdrop-filter:blur(10px) saturate(1.05);border-radius:var(--radius);
border:1px solid rgba(255,255,255,0.08);padding:14px;display:flex;flex-direction:column;gap:12px;box-shadow:var(--card-shadow);
transition:all 0.2s ease;}
.panel:hover{transform:translateY(-4px);box-shadow:0 16px 40px rgba(8,14,40,0.6);}

.files{display:flex;flex-direction:column;gap:12px;min-height:200px;}
.files .top{display:flex;justify-content:space-between;align-items:center;gap:8px;}
.brand{font-size:18px;font-weight:700;color:var(--accent);display:flex;align-items:center;gap:8px;}
.brand i{font-size:20px;transform:translateY(-1px);}
.file-list{display:flex;flex-direction:column;gap:6px;overflow:auto;max-height:calc(100vh - 220px);}
.file-item{padding:8px;border-radius:12px;display:flex;justify-content:space-between;align-items:center;cursor:pointer;background:rgba(255,255,255,0.02);transition:all .14s ease;}
.file-item:hover{background:rgba(108,140,255,0.1);}
.file-item.active{background:rgba(108,140,255,0.12);color:#fff;}

.editor-area{display:flex;flex-direction:column;gap:10px;}
.topbar{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;}
.title{font-size:14px;color:var(--muted);}
.controls{display:flex;gap:6px;flex-wrap:wrap;margin-top:6px;}
.btn{padding:8px 10px;border-radius:12px;border:none;cursor:pointer;font-weight:600;display:inline-flex;align-items:center;gap:6px;
transition:all 0.15s ease;background:linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01)); color:var(--muted);}
.btn:hover{transform:translateY(-2px);color:#fff;box-shadow:0 6px 16px rgba(0,0,0,0.35);}
.primary{background:linear-gradient(90deg,var(--accent), var(--accent-light)); color:#04253b; font-weight:700;}
.secondary{background:transparent; border:1px solid rgba(255,255,255,0.05); color:var(--muted);}

.cm-wrap{border-radius:14px; overflow:hidden; border:1px solid rgba(255,255,255,0.02);}
.CodeMirror{height:calc(100vh - 400px); background: var(--glass-dark); color:#e8f1ff; font-size:13px;}
.console{background:rgba(0,0,0,0.4);border-radius:12px;padding:10px;font-family:monospace;color:#cfe7ff;max-height:160px;overflow:auto;border:1px solid rgba(255,255,255,0.04);}

footer{text-align:center;font-size:13px;color:var(--muted);margin-top:14px;}
.note{color:#c7d7ff;font-weight:600;}
@media(max-width:1000px){.app{grid-template-columns:1fr;}}
@media(max-width:600px){.CodeMirror{height:calc(100vh - 380px); font-size:12px;}}
@media(max-width:400px){.topbar{flex-direction:column;align-items:flex-start;} .controls{flex-wrap:wrap;}}
</style>
</head>
<body>

<div class="app">
  <div class="panel files" id="sidebar">
    <div class="top">
      <div class="brand"><i class="fa-solid fa-rocket"></i> JavaRunner</div>
      <div>
        <button class="btn" id="newBtn" title="New file"><i class="fa-solid fa-file-circle-plus"></i></button>
      </div>
    </div>
    <div class="file-list" id="fileList"></div>
  </div>

  <div class="panel editor-area">
    <div class="topbar">
      <div class="title">Interactive Java IDE </div>
      <div class="controls">
        <button class="btn primary" id="runBtn"><i class="fa-solid fa-play"></i> Run</button>
        <button class="btn secondary" id="saveBtn"><i class="fa-solid fa-floppy-disk"></i> Save</button>
        <button class="btn secondary" id="downloadBtn"><i class="fa-solid fa-download"></i> Download</button>
        <button class="btn secondary" id="formatBtn"><i class="fa-solid fa-align-left"></i> Format</button>
        <button class="btn secondary" id="deleteBtn"><i class="fa-solid fa-trash"></i> Delete</button>
      </div>
    </div>
    <div class="cm-wrap" id="cmWrap">
      <div id="editor"></div>
    </div>
    <div class="console" id="console">Console output will appear here.</div>
  </div>
</div>

<footer>
  Made with care for <span class="note">Ragini Didi</span> — Happy Java Learning!
</footer>

<script>
const editor = CodeMirror(document.getElementById('editor'), {
  mode:"text/x-java", lineNumbers:true, tabSize:4, indentUnit:4,
  autoCloseBrackets:true, matchBrackets:true, theme:"default",
  value:`class Main {
  public static void main(String[] args) {
      System.out.println("Hello Ragini Didi! Welcome to JavaRunner");
  }
}`
});

function resizeEditor(){ editor.setSize('100%', window.innerHeight-400); }
window.addEventListener('resize',resizeEditor);
setTimeout(resizeEditor,200);

let files = JSON.parse(localStorage.getItem('java_runner_files')||'{}');
let active = localStorage.getItem('java_runner_active') || null;
const fileListEl = document.getElementById('fileList');
const consoleEl = document.getElementById('console');

function saveToStorage(){ localStorage.setItem('java_runner_files',JSON.stringify(files)); }
function setActive(name){ active=name; localStorage.setItem('java_runner_active',active); renderFiles(); editor.setValue(files[active]); }

function renderFiles(){
  fileListEl.innerHTML='';
  Object.keys(files).forEach(f=>{
    const div=document.createElement('div');
    div.className='file-item'+(f===active?' active':'');
    div.innerText=f;
    div.onclick=()=>setActive(f);
    fileListEl.appendChild(div);
  });
}

function newFile(){
  const name=prompt('Enter new file name (with .java):','NewFile.java');
  if(!name) return;
  if(files[name]){ alert('File already exists!'); return;}
  files[name]=`class ${name.replace('.java','')} {\n    public static void main(String[] args) {\n        System.out.println("Hello Ragini Didi!");\n    }\n}`;
  saveToStorage();
  setActive(name);
}

function saveFile(){ if(!active)return; files[active]=editor.getValue(); saveToStorage(); consoleEl.innerText='Saved locally ✔';}
function downloadFile(){ if(!active)return; const blob=new Blob([editor.getValue()],{type:'text/plain'}); const a=document.createElement('a'); a.href=URL.createObjectURL(blob); a.download=active; a.click(); URL.revokeObjectURL(a.href);}
function deleteFile(){ if(!active) return; if(confirm(`Delete ${active}?`)){ delete files[active]; saveToStorage(); active=null; editor.setValue(''); renderFiles(); }}

document.getElementById('newBtn').onclick=newFile;
document.getElementById('saveBtn').onclick=saveFile;
document.getElementById('downloadBtn').onclick=downloadFile;
document.getElementById('deleteBtn').onclick=deleteFile;
document.getElementById('formatBtn').onclick=()=>{ editor.execCommand('selectAll'); editor.execCommand('indentAuto'); editor.execCommand('singleSelection');};

document.getElementById('runBtn').onclick=async()=>{
  if(!active) return; saveFile(); consoleEl.innerText='Running...';
  try{
    const resp=await fetch('/run-java',{method:'POST', headers:{'Content-Type':'application/json'}, body: JSON.stringify({code: editor.getValue(), filename: active})});
    const data=await resp.json();
    consoleEl.innerText=data.output||data.error||'No output';
  }catch(e){ consoleEl.innerText='Error: '+e.message; }
};

if(Object.keys(files).length===0) newFile(); else setActive(Object.keys(files)[0]);
</script>
</body>
</html>