Why this java application print "true"?
- by user292084
This is my first Class Hello.java
public class Hello {
String name = "";
}
This is my second Class Test1.java
public class Test1 {
public static void main(String[] args) {
Hello h = new Hello();
Test1 t = new Test1();
t.build(h);
System.out.println((h.name));
}
void build(Hello h){
h.name = "me";
}
}
When I run Test1.java, it prints "me". I think I understand, because of "reference transfer".
This is my third Class Test2.java
public class Test2 {
public static void main(String[] args) {
Hello h = null;
Test2 t = new Test2();
t.build(h);
System.out.println(((h == null)));
}
void build(Hello h){
h = new Hello();
}
}
When I run Test2.java, it prints "true", why ? Is it "reference transfer" no longer? I am confused.
