혀가 길지 않은 개발자

build.gradle (Module: app) dependencies { // RecyclerView implementation 'androidx.recyclerview:recyclerview:1.1.0' } recyclerview_item.xml MyAdapter.java package com.jwsoft.javaproject; import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.TextView; import androidx.annotation.NonNull; import androidx.re..

activity_main.xml MainActivity.java package com.jwsoft.javaproject; import androidx.appcompat.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.ProgressBar; public class MainActivity extends AppCompatActivity { Button btnVisible; Button btnGone; ProgressBar pbLoading; @Override protected void onCreate(Bundle savedInstan..

activity_main.xml MainActivity.java package com.jwsoft.javaproject; import androidx.appcompat.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.Toast; public class MainActivity extends AppCompatActivity { Button btnClick; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); ..

Day.java package com.jwsoft.javaproject; enum Day { Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday } activity_main.xml MainActivity.java package com.jwsoft.javaproject; import androidx.appcompat.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Toast; public class MainActivity extends AppCompatActivity implements View.OnClickListener..

T : read/write 모두 가능 ? extends T : read 만 가능한 서브타입 와일드카드 ? super T : write 만 가능한 슈퍼 타입 와일드카드 User.java package com.jwsoft.javaproject; public class User { private S name; private I age; public User(S name, I age) { this.name = name; this.age = age; } public void setName(S name) { this.name = name; } public void setAge(I age) { this.age = age; } public S getName() { return this.name; } public I g..