Created
April 9, 2016 16:00
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筋トレ大好きな文系女学生のJava入門_コンストラクタ ref: http://qiita.com/amippy/items/ea83523e7ea72514518c
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1 public class Main{ | |
2 public static void main(String[] args){ | |
3 MuscleBoy mb = new MuscleBoy(); //インスタンスを生成 | |
4 mb.name = "ホエイ"; //初期値セット | |
5 mb.hp = 100; //初期値セット | |
6 MuscleGirl mg = new MuscleGirl(); //またインスタンスを生成 | |
7 mg.name = "アミノ"; //また初期値 | |
8 mg.hp = 100; //また初期値 | |
9 Protein p = new Protein(); //インスタンスを生成 | |
10 p.name = "プロテイン"; //初期値 | |
11 p.recover(mb); //やっとメインプログラム | |
12 p.recover(mg); | |
13 } | |
14} | |
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フィールドの初期値 | |
int型,short型,long型等の数値の型 ------> 0 | |
char型(文字)---------------------------> ¥u0000 | |
boolean型-----------------------------> false | |
int[]型-------------------------------> null | |
String型------------------------------> null | |
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1 public class MuscleBoy{ | |
2 int hp; | |
3 String name; | |
4 | |
5 void run(){ | |
6 System.out.println(this.name + "は走っている"); | |
7 } | |
8 MuscleBoy(){ | |
9 this.hp = 100; //hpフィールドを100で初期化 | |
10 } | |
11} |
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1 public class Main{ | |
2 public static void main(String[] args){ | |
3 MuscleBoy mb = new MuscleBoy(); | |
4 | |
5 System.out.println(mb.hp); //すでにhpには100が代入されているため、画面に「100」と表示 | |
6 } | |
7} |
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コンストラクタの基本 | |
1 public class クラス名{ | |
2 クラス名(){ | |
3 //ここに自動実行処理を記述 | |
4 } | |
5} |
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1 public class MuscleBoy{ | |
2 int hp; | |
3 String name; | |
4 | |
5 MuscleBoy(String name){ //引数として文字列を1つ受け取る | |
6 this.hp = 100; | |
7 this.name = name; | |
8 } | |
9} |
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1 public class Main{ | |
2 public static void main(String[] args){ | |
3 MuscleBoy mb = new MuscleBoy("ホエイ"); //コンストラクタに「ホエイ」が渡される | |
4 | |
5 System.out.println(mb.hp); //100と表示 | |
6 SYstem.out.println(mb.name); //ホエイと表示 | |
7 } | |
8} |
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1 public class MuscleBoy{ | |
2 int hp; | |
3 String name; | |
4 | |
5 MuscleBoy(String name){ //以前からあったコンストラクタ1 | |
6 this.hp = 100; | |
7 this.name = name; | |
8 } | |
9 MuscleBoy(){ //新しく作ったコンストラクタ2 | |
10 this("Nothing"); | |
11 | |
12 } | |
13} |
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1 public class Main{ | |
2 pubic static void main(String[] args){ | |
3 MuscleBoy mb1 = new MuscleBoy("ホエイ"); //文字列引数があるためコンストラクタ1が呼び出される | |
4 | |
5 System.out.println(mb.name); //画面に「ホエイ」と表示 | |
6 MuscleBoy mb2 = new MuscleBoy(); //引数がないのでコンストラクタ2が呼び出される | |
7 | |
8 System.out.println(mb2.name); //画面に「Nothing」と表示 | |
9 } | |
10} |
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