Java 27 and 26: runnable demos and captured output for every JEP, plus version lanes

Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01B38FGKKam5SCGgwgduVAh3

api-diff/dump_api.py

@@ -0,0 +1,33 @@
+#!/usr/bin/env python3
+"""Dump the public API signatures of every exported class in the JDK's java.se-ish modules.
+usage: dump_api.py <JAVA_HOME> <out-file>"""
+import subprocess, sys, re, os
+home, out = sys.argv[1], sys.argv[2]
+env = {k:v for k,v in os.environ.items() if k!='JAVA_TOOL_OPTIONS'}
+jimage = subprocess.run([f'{home}/bin/jimage','list',f'{home}/lib/modules'],capture_output=True,text=True,env=env).stdout
+mods = {}
+cur=None
+for line in jimage.splitlines():
+    if line.startswith('Module: '): cur=line.split(': ')[1].strip(); mods[cur]=[]
+    elif cur and line.strip().endswith('.class'):
+        mods[cur].append(line.strip()[:-6])
+WANT = re.compile(r'^(java|jdk\.(jfr|httpserver|incubator\.vector|management|net|jshell|jartool|jlink|jpackage|javadoc|compiler|jcmd|unsupported|security\.auth)|javafx)')
+res=[]
+for m,classes in sorted(mods.items()):
+    if not WANT.match(m): continue
+    names=[]
+    for c in classes:
+        if c=='module-info': continue
+        pk=c.rsplit('/',1)[0].replace('/','.') if '/' in c else ''
+        if re.search(r'(^|\.)(internal|impl)(\.|$)|^sun\.|^com\.sun\.(?!net\.httpserver|management|security\.auth|source)',pk): continue
+        names.append(c.replace('/','.'))
+    if not names: continue
+    # javap handles binary names with $ for nested
+    names=[n for n in names if not re.search(r'\$\d',n)]
+    txt=''
+    for i in range(0,len(names),200):
+        p=subprocess.run([f'{home}/bin/javap','--module',m,'-public']+names[i:i+200],capture_output=True,text=True,env=env)
+        txt+=p.stdout
+    res.append(f'##### MODULE {m}\n'+txt)
+open(out,'w').write('\n'.join(res))
+print(out, sum(len(r) for r in res)//1024,'KB')