HelloAsm（二）

根據制定的方法名和修飾符刪除一個方法：

public class RemoveMethodAdapter extends ClassAdapter {
	private String mName;
	private String mDesc;

	public RemoveMethodAdapter(ClassVisitor cv, String name, String desc) {
		super(cv);
		
		mName = name;
		mDesc = desc;
	}

	@Override
	public MethodVisitor visitMethod(int access, String name, String desc, 
			String signature, String[] exceptions) {
		if (name.equals(mName) && desc.equals(mDesc)) {
			return null;
		}
		
		return super.visitMethod(access, name, desc, signature, exceptions);
	}

	
}

ClassWriter cw2 = new ClassWriter(0);
		ClassAdapter ca2 = new RemoveMethodAdapter(cw2, "compareTo", "(Ljava/lang/Object;)I");
		ClassReader cr4 = new ClassReader(b1);
		cr4.accept(ca2, 0);
		
		byte[] b2 = cw2.toByteArray();
		ClassReader cr5 = new ClassReader(b2);
		cr5.accept(cp, 0);

增加類成員：

public class AddFieldAdapter extends ClassAdapter {
	private int fAcc;
	private String mName;
	private String mDesc;
	private boolean isFieldPresent;

	public AddFieldAdapter(ClassVisitor cv, int acc, String name, String desc) {
		super(cv);
		
		fAcc = acc;
		mName = name;
		mDesc = desc;
	}

	@Override
	public FieldVisitor visitField(int access, String name, String desc, 
			String signature, Object value) {
		if (name.equals(desc)) {
			isFieldPresent = true;
		}
		
		return super.visitField(access, name, desc, signature, value);
	}

	@Override
	public void visitEnd() {
		if (!isFieldPresent) {
			FieldVisitor fv = cv.visitField(fAcc, mName, mDesc, null, null);
			
			if (fv != null) {
				fv.visitEnd();
			}
		}
		
		super.visitEnd();
	}

}