package test; class A{ int aa = 10; } class B{ void c(A a){ // 可以傳類別近來 a.aa = 3; } } public class class_text { public static void main(String[] args) { A a = new A(); B b = new B(); b.c(a); System.out.println(a.aa); // a.aa = 3 } }2.呼叫自己的function
package test; public class class_test2 { int i; public static void main(String[] args) { class_test2 c = new class_test2(); // 自己 c.i = 10; c.A(); } void A(){ System.out.println(i); } }