안슈/2강/if문활용 1

텍스트 박스에 나이를 입력하고

버튼 누르면

[유아 초 중 고 성인] 중 하나 출력

 

xml 코드

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity"
    android:orientation="vertical">
 
    <TextView
        android:id="@+id/tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="TextView"
        tools:layout_editor_absoluteX="41dp"
        tools:layout_editor_absoluteY="19dp" />
 
    <EditText
 
        android:id="@+id/et"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:ems="10"
        android:inputType="number"//숫자만 쓰도록 강제
        tools:layout_editor_absoluteX="43dp"
        tools:layout_editor_absoluteY="69dp" />
 
    <Button
        android:id="@+id/bt"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button"
        tools:layout_editor_absoluteX="42dp"
        tools:layout_editor_absoluteY="148dp" />
 
</LinearLayout>

package com.example.myapplication01;
 
import androidx.appcompat.app.AppCompatActivity;
 
import android.icu.lang.UCharacter;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
 
public class MainActivity extends AppCompatActivity {
 
    Button bt;
    EditText et;
    TextView tv;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        bt = (Button) findViewById(R.id.bt);
        et = (EditText) findViewById(R.id.et);
        tv = (TextView) findViewById(R.id.tv);
 
        tv.setText("나이를 입력하세요");
 
        bt.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String g = et.getText().toString();
                int h = Integer.parseInt(g);
                if (h < 8) {
                    tv.setText("유아");
                } else if (h < 14) {
                    tv.setText("초등");
                } else if (h < 17) {
                    tv.setText("중학");
                } else if (h < 20) {
                    tv.setText("고등");
                } else {
                    tv.setText("성인");
                }//
 
            }
 
        });
    }
}