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ArgumentMethod.java
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package example.MethodExample;
/**
* The Call by Value and Call by Referene example.
*
* 若是傳遞某個 object 給 method 時，objects 是以 call by reference 方式來傳遞。
*
* Reference:
* - http://brownydev.blogspot.com/2011/06/java-call-by-value-call-by-reference.html
* - https://sites.google.com/site/dychen1127/developer-java/java-call-by-reference
* - https://sites.google.com/site/dychen1127/developer-java/java-call-by-value
* - https://wayne265265.pixnet.net/blog/post/112556555-%E3%80%90%E6%95%99%E5%AD%B8%E3%80%91call-by-value%2C-call-by-address%2C-call-by-referenc
*/
class Data {
int x;
int y;
}
public class ArgumentMethod {
/**
* Call by value example.
* @param args
*/
public static void swap(int x, int y) {
//! 此範例無法讓資料進行交換
int tmp = x;
x = y;
y = tmp;
System.out.printf("call swap(), x = %d, y = %d\n", x, y);
}
/**
* Call by reference example.
* @param args
*/
public static void swap_cbr(Data data) {
//! 如果要使用call by reference, 需要傳遞參數為array, class，讓變數進入method後計算一併修改。
int tmp = data.x;
data.x = data.y;
data.y = tmp;
System.out.printf("call swap_cbr(), x = %d, y = %d\n", data.x, data.y);
}
/**
* Call by address.
*
* @param args
*/
public static void swap_cba(Data data) {
}
public static void main(String[] args) {
Data d = new Data();
int x = 10;
int y = 20;
d.x = 10;
d.y = 20;
System.out.printf("before call function, x = %d, y = %d\n", x, y);
// call by value.
swap(x, y);
// call by reference
swap_cbr(d);
System.out.printf("after call swap function, x = %d, y = %d\n", x, y);
System.out.printf("after call swap_cbr function, x = %d, y = %d\n", d.x, d.y);
}
}