혀가 길지 않은 개발자

activity_main.xml MainActivity.kt package com.jwsoft.kotlinproject import androidx.appcompat.app.AppCompatActivity import android.os.Bundle import android.widget.Toast import kotlinx.android.synthetic.main.activity_main.* class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) btnCli..

Day.kt package com.jwsoft.kotlinproject enum class Day { MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY, SUNDAY } activity_main.xml MainActivity.kt package com.jwsoft.kotlinproject import androidx.appcompat.app.AppCompatActivity import android.os.Bundle import android.view.View import android.widget.Toast import kotlinx.android.synthetic.main.activity_main.* class MainActivity : AppCompa..

T : 별도의 Wildcard 정의가 없이 read/write 모두 가능 in T : Java 의 ? super T 와 같음. input 의 약자이며 write 만 가능 out T : Java 의 ? extends T 와 같음. output 의 약자이며 read 만 가능 User.kt package com.jwsoft.kotlinproject class User ( var name: S, var age: I ) MainActivity.kt package com.jwsoft.kotlinproject import androidx.appcompat.app.AppCompatActivity import android.os.Bundle import android.util.Log class MainActivity :..

common_toolbar.xml activity_third.xml activity_second.xml activity_main.xml ThirdActivity.kt package com.jwsoft.kotlinproject import android.content.Intent import androidx.appcompat.app.AppCompatActivity import android.os.Bundle import android.view.View import android.widget.ImageButton import android.widget.TextView import kotlinx.android.synthetic.main.activity_third.* class ThirdActivity : Ap..

activity_main.xml MainActivity.kt package com.jwsoft.kotlinproject import android.graphics.drawable.ShapeDrawable import android.graphics.drawable.shapes.OvalShape import android.os.Build import androidx.appcompat.app.AppCompatActivity import android.os.Bundle import kotlinx.android.synthetic.main.activity_main.* class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState..