staticメソッドからはstaticでない変数(インスタンス変数)は使えない
public class Number {
// private int num; この書き方はエラー!
private static int num;
public static void main(String[] args) {
System.out.println("Number is = " + num);
}
public void setSize (int n) {
num = n;
}
public int getSize() {
return num;
}
}
- 逆(?)も然り
public class Number2 {
private int num;
public static void main(String[] args) {
System.out.println("size is" + getNum());
}
public void setNum(int n) {
num = n;
}
public int getNum() {
return num;
}
}
上の例はこうならOK
public class Number2 {
private static int num;public static void main(String[] args) {
System.out.println("size is" + getNum());
}
public void setNum(int n) {
num = n;
}
public static int getNum() {
return num;
}
}