activity_main.xml MainActivity.java package com.example.contextmenu; import androidx.appcompat.app.AppCompatActivity; import android.content.Context; import android.graphics.Color; import android.os.Bundle; import android.view.ContextMenu; import android.view.MenuItem; import android.view.View; import android.widget.TextView; public class MainActivity extends AppCompatActivity { TextView text; @..

activity_main.xml MainActiviy.java package com.example.optionmenu2; import androidx.appcompat.app.AppCompatActivity; import android.os.Bundle; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.widget.Toast; public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(save..

package swing.frame; import javax.swing.JFrame; public class MyFrame extends JFrame { public MyFrame(String title) { this.setTitle(title); //this없어도됨 //title설정 this.setSize(680, 700);//size설정(width,height) setLocation(800, 300); //위치 설정(x,y) //종료관리(보통 EXIT_ON_CLOSE를 사용, 상수3) setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //창그리기 this.setVisible(true); } public static void main(String[] args) { /..