请问您知道怎么获取ByteByReference里面的数据了吗?

2025-03-15 06:13:20
推荐回答(2个)
回答1:

一、按值传递:pass by value

指的是在方法调用时,传递的参数是按值的拷贝传递
public class TempTest {
private void test1(int a){
//做点事情
}
public static void main(String[] args) {
TempTest t = new TempTest();
int a = 3;
t.test1(a);//这里传递的参数a就是按值传递
}
}
按值传递重要特点:传递的是值的拷贝,也就是说传递后就互不相关了。
示例如下:
public class TempTest {
private void test1(int a){
a = 5;
System.out.println("test1方法中的a="+a);
}
public static void main(String[] args) {
TempTest t = new TempTest();
int a = 3;
t.test1(a);//传递后,test1方法对变量值的改变不影响这里的a
System.out.println(”main方法中的a=”+a);
}
}
运行结果是:
test1方法中的a=5
main方法中的a=3

二、按引用传递:pass by reference
指的是在方法调用时,传递的参数是按引用进行传递,其实传递的引用的地址,也就是变量所对应的内存空间的地址。
public class TempTest {
private void test1(A a){
}
public static void main(String[] args) {
TempTest t = new TempTest();
A a = new A();
t.test1(a); //这里传递的参数a就是按引用传递
}
}
class A{
public int age = 0;
}
按引用传递的重要特点:传递的是值的引用,也就是说传递前和传递后都指向同一个引用(也就是同一个内存空间)。
public class TempTest {
private void test1(A a){
a.age = 20;
System.out.println("test1方法中的age="+a.age);
}
public static void main(String[] args) {
TempTest t = new TempTest();
A a = new A();
a.age = 10;
t.test1(a);
System.out.println(”main方法中的age=”+a.age);
}
}

class A{
public int age = 0;
}
运行结果如下:
test1方法中的age=20
main方法中的age=20

三、说明
1:“在Java里面参数传递都是按值传递”这句话的意思是:按值传递是传递的值的拷贝,按引用传递其实传递的是引用的地址值,所以统称按值传递。
2:在Java里面只有基本类型和按照下面这种定义方式的String是按值传递,其它的都是按引用传递。就是直接使用双引号定义字符串方式:String str = “Java私塾”;

回答2:

ByteByReference by=...;
by.getpointer().get...

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