익명클래스를 이용해서 이벤트리스너 만들기

View.OnClickListener on=new View.OnClickListener() {
    @Override
    public void onClick(View v) {

        Toast.makeText(MainActivity.this, "hihi", Toast.LENGTH_SHORT).show();
    }
};
Button button01=findViewById(R.id.button01);
button01.setOnClickListener(on);
 

Button button01=findViewById(R.id.button01);

button01.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {

        Toast.makeText(MainActivity.this, "hihA", Toast.LENGTH_SHORT).show();
    }
});

((Button) findViewById(R.id.button01)).setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        
    }
});