看程序写结果，并画内存图解释

        public static void main(String[] args) {
            int a = 10;
            int b = 20;
            System.out.println("a:"+a+",b:"+b);            //a = 10,b = 20
            change(a,b);
            System.out.println("a:"+a+",b:"+b);            //a = 10,b = 20
        }
        public static void change(int a,int b) {        //a = 10, b= 20
            System.out.println("a:"+a+",b:"+b);            //a = 10,b = 20
            a = b;                                        //a = 20
            b = a + b;                                    //b = 40
            System.out.println("a:"+a+",b:"+b);            //a = 20, b = 40
        }

        public static void main(String[] args) {
            int[] arr = {1,2,3,4,5};
            change(arr);
            System.out.println(arr[1]);
        }
        public static void change(int[] arr) {            //1,4,3,8,5
            for(int x=0; x<arr.length; x++) {
                if(arr[x]%2==0) {
                    arr[x]*=2;
                }
            }
        }