Java中的引用行为更类似于C++中的指针。以下代码作为C++中引用行为与Java引用行为的对比。
C++
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using namespace std;
class Hello {
public:
string key;
Hello(){
key = "Hello";
};
Hello(string str):key(str){
}
};
int () {
Hello hello;
Hello & helloRef = hello;
Hello hello1("hello1");
hello = hello1;
cout << "hello.key : t" << hello.key << endl;
cout << "helloRef.key : t" << helloRef.key << endl;
Hello hello2("hello2");
helloRef = hello2;
cout << "hello.key : t" << hello.key << endl;
cout << "helloRef.key : t" << helloRef.key << endl;
return 0;
}
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output
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hello.key : hello1
helloRef.key : hello1
hello.key : hello2
helloRef.key : hello2
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Java
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package main.java;
public class TestRef {
private static class Hello{
String key;
Hello(){
key = "hello";
}
Hello(String str){
key = str;
}
}
public static void (String[] args){
Hello hello = new Hello();
Hello helloRef = hello;
Hello hello1 = new Hello("hello1");
hello = hello1;
System.out.println("hello.key : t" + hello.key);
System.out.println("helloRef.key : t" + helloRef.key);
Hello hello2 = new Hello("hello2");
helloRef = hello2;
System.out.println("hello.key : t" + hello.key);
System.out.println("helloRef.key : t" + helloRef.key);
}
}
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output
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hello.key : hello1
helloRef.key : hello
hello.key : hello1
helloRef.key : hello2
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