import com.sun.image.codec.jpeg.*;
import java.awt.image.*;
import java.awt.geom.*;
import java.awt.*;
import java.io.*;
class PaintCanvas extends Canvas {
BufferedImage image;
Graphics2D g_2d;
PaintCanvas() {
image=new BufferedImage(300,300,BufferedImage.TYPE_INT_RGB);
g_2d=image.createGraphics();
Rectangle2D rect = new Rectangle2D.Double(0,0,300,300);
Ellipse2D ellipse= new Ellipse2D. Double (30,30,80,30);
g_2d.setColor(Color.yellow);
g_2d.fill(rect);
g_2d.setColor(Color.black);
AffineTransform trans=new AffineTransform();
for(int i=1;i<=24;i++){
trans.rotate(15.0*Math.PI/180,70,45);
g_2d.setTransform(trans);
g_2d.draw(ellipse);
}
}
public BufferedImage getImage() {
return image;
}
}
public class JPG {
public static void main(String args[]) {
try {
JPEGImageEncoder encoder=
JPEGCodec.createJPEGEncoder(new FileOutputStream("geometry.jpg"));
PaintCanvas canvas=new PaintCanvas();
encoder.encode(canvas.getImage());
}
catch(Exception ee) {}
}
}
Error:Internal error: (java.lang.NoClassDefFoundError) Could not initialize class com.intellij.util.io.FileChannelUtil
java.lang.NoClassDefFoundError: Could not initialize class com.intellij.util.io.FileChannelUtil
at com.intellij.util.io.ReadWriteDirectBufferWrapper$FileContext$1.execute(ReadWriteDirectBufferWrapper.java:50)
at com.intellij.util.io.ReadWriteDirectBufferWrapper$FileContext$1.execute(ReadWriteDirectBufferWrapper.java:42)
at com.intellij.openapi.util.io.FileUtilRt.doIOOperation(FileUtilRt.java:945)
at com.intellij.util.io.ReadWriteDirectBufferWrapper$FileContext.<init>(ReadWriteDirectBufferWrapper.java:42)
at com.intellij.util.io.ReadWriteDirectBufferWrapper.create(ReadWriteDirectBufferWrapper.java:27)
at com.intellij.util.io.DirectBufferWrapper.getBuffer(DirectBufferWrapper.java:24)
at com.intellij.util.io.ReadWriteDirectBufferWrapper.getBuffer(ReadWriteDirectBufferWrapper.java:16)
at com.intellij.util.io.PagedFileStorage$StorageLock.createValue(PagedFileStorage.java:631)
at com.intellij.util.io.PagedFileStorage$StorageLock.get(PagedFileStorage.java:558)
at com.intellij.util.io.PagedFileStorage$StorageLock.access$500(PagedFileStorage.java:466)
at com.intellij.util.io.PagedFileStorage.getBufferWrapper(PagedFileStorage.java:407)
at com.intellij.util.io.PagedFileStorage.getBuffer(PagedFileStorage.java:371)
at com.intellij.util.io.PagedFileStorage.putInt(PagedFileStorage.java:144)
at com.intellij.util.io.ResizeableMappedFile.putInt(ResizeableMappedFile.java:222)
at com.intellij.util.io.PersistentEnumeratorBase.markDirty(PersistentEnumeratorBase.java:597)
at com.intellij.util.io.PersistentEnumeratorBase.<init>(PersistentEnumeratorBase.java:185)
at com.intellij.util.io.PersistentBTreeEnumerator.<init>(PersistentBTreeEnumerator.java:73)
at com.intellij.util.io.PersistentEnumeratorDelegate.<init>(PersistentEnumeratorDelegate.java:47)
at com.intellij.util.io.PersistentHashMap.<init>(PersistentHashMap.java:149)
at com.intellij.util.io.PersistentHashMap.<init>(PersistentHashMap.java:138)
at com.intellij.util.io.PersistentHashMap.<init>(PersistentHashMap.java:129)
at com.intellij.util.io.PersistentHashMap.<init>(PersistentHashMap.java:121)
at com.intellij.util.io.PersistentHashMap.<init>(PersistentHashMap.java:114)
at org.jetbrains.jps.incremental.storage.AbstractStateStorage.createMap(AbstractStateStorage.java:124)
at org.jetbrains.jps.incremental.storage.AbstractStateStorage.<init>(AbstractStateStorage.java:27)
at org.jetbrains.jps.incremental.storage.FileTimestampStorage.<init>(FileTimestampStorage.java:27)
at org.jetbrains.jps.incremental.storage.ProjectStamps.<init>(ProjectStamps.java:39)
at org.jetbrains.jps.incremental.storage.ProjectTimestamps.<init>(ProjectTimestamps.java:19)
at org.jetbrains.jps.cmdline.BuildRunner.load(BuildRunner.java:92)
at org.jetbrains.jps.cmdline.BuildSession.runBuild(BuildSession.java:274)
at org.jetbrains.jps.cmdline.BuildSession.run(BuildSession.java:130)
at org.jetbrains.jps.cmdline.BuildMain$MyMessageHandler.lambda$channelRead0$0(BuildMain.java:232)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
at java.base/java.lang.Thread.run(Thread.java:831)
Could not initialize class com.intellij.util.io.FileChannelUtil不能实例化
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设置项目的JDK版本到你项目正确的版本，因为有些IDEA默认会设置为1.6版本。