A {@link PrintClassVisitor PrintClassVisitor} that prints the ASM code thatgenerates the classes it visits. This class visitor can be used to quickly write ASM code to generate some given bytecode:
import org.objectweb.asm.*; import java.io.FileOutputStream; public class Dump implements Constants { public static void main (String[] args) throws Exception { ClassWriter cw = new ClassWriter(false); CodeVisitor cv; cw.visit(ACC_PUBLIC + ACC_SUPER, "Hello", "java/lang/Object", null, "Hello.java"); { cv = cw.visitMethod(ACC_PUBLIC + ACC_STATIC, "main", "([Ljava/lang/String;)V", null, null); cv.visitFieldInsn(GETSTATIC, "java/lang/System", "out", "Ljava/io/PrintStream;"); cv.visitLdcInsn("hello"); cv.visitMethodInsn(INVOKEVIRTUAL, "java/io/PrintStream", "println", "(Ljava/lang/String;)V"); cv.visitInsn(RETURN); cv.visitMaxs(2, 1); } { cv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null); cv.visitVarInsn(ALOAD, 0); cv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V"); cv.visitInsn(RETURN); cv.visitMaxs(1, 1); } cw.visitEnd(); FileOutputStream os = new FileOutputStream("Dumped.class"); os.write(cw.toByteArray()); os.close(); } }