我不了解这个构造函数public B（B b）
我试图了解此构造函数的功能...请帮助我..........我想知道这种类型的构造函数的功能
包TASK04;
A类{
public static int temp = 4;
public int sum;
public int y;
public A() {
y = temp - 2;
sum = temp + 1;
temp -= 2;
}
public void methodA(int m, int n) {
int x = 0;
y = y + m + (temp++);
x = x + 1 + n;
sum = sum + x + y;
System.out.println(x + " " + y + " " + sum);
}
}
B类{
public static int x;
public int y = 5;
public int temp = -5;
public int sum = 2;
public B() {
y = temp + 3;
sum = 3 + temp + 2;
temp -= 2;
}
public B(B b) {
sum = b.sum;
x = b.x;
b.methodB(2, 3);
}
public void methodA(int m, int n) {
int x = 2;
y = y + m + (temp++);
x = x + 5 + n;
sum = sum + x + y;
System.out.println(x + " " + y + " " + sum);
}
public void methodB(int m, int n) {
int y = 0;
y = y + this.y;
x = this.y + 2 + temp;
methodA(x, y);
sum = x + y + sum;
System.out.println(x + " " + y + " " + sum);
}
}
包TASK04;
公开课测试{
public static void main(String[] args) {
A a1 = new A();
B b1 = new B();
B b2 = new B(b1);
b1.methodA(1, 2);
b2.methodB(3, 2);
}
}