Java-装箱与拆箱
public static void main(String[] args) {
User user = new User();
System.out.println(user.getA());
System.out.println(user.getB());
}
public static class User{
private int a;
private Integer b;
public int getA() {
return a;
}
public void setA(int a) {
this.a = a;
}
public Integer getB() {
return b;
}
public void setB(Integer b) {
this.b = b;
}
}
控制台输出: