java基础|Java方法的形参实参与值传递引用传递值传递|引用传递|java

方法的形参、实参 【java基础|Java方法的形参实参与值传递引用传递】public static void main(String[] args) {
int sum1 = sum(20, 30); // 调用方法时，括号内为实参
System.out.println(sum1);

int a = 10; int b = 20; int sum2 = sum(a, b); // a b 也是是实参 System.out.println(sum2); double avg = avg(a,b); System.out.println(avg);

}
private static double avg(int a, int b) {// a b 为形参
int sum = sum(a, b); // 只要是调用方法，括号内就是实参！a b 是实参
return sum / 2.0;
}
private static int sum(int a, int b) {// a b 为形参
return a + b;
}
值传递、引用(地址)传递

public class MethodParamTest { public static void main(String[] args) { // 值传递 int a = 10; change(a); System.out.println(a); // 10// 引用传递 B b = new B(); change(b); System.out.println(b.num); // 11 }private static void change(int a) { ++a; }public static void change(B b){ ++ b.num; } }class B{ public int num = 10; }