传递对象

1

public class test {

	public static void main(String[] args) {
		A a = new A();
		System.out.println(a.v);// 0

		setValue(a);
		System.out.println(a.v);// 1

		setA(a);
		System.out.println(a.v);// 1
	}

	public static void setValue(A a) {
		a.v = 1;
	}

	public static void setA(A a1) {
		a1 = new A();
	}
}

class A {
	int v = 0;
}