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Methods vs Constructors in Java
(11 answers)
Closed 7 years ago.
is setMnemonic(int) a constructor or method?
http://docs.oracle.com/javase/tutorial/uiswing/components/menu.html
It is a method. A constructor will always consist of the name of the class being called on. This is a method, because it is called after an instance of some class, using the dot.
Related
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Calling a method inside another method in same class
(5 answers)
Why can a method be called without instance?
(3 answers)
Closed 8 months ago.
getClass() in java is a method which returns runtime class of an object. For example:
String str = "something";
Then str.getClass() will return java.lang.String. That's okay. However, what does it mean when the getClass() called "dependently". I mean, in this case getClass() is called after the . operator. But in some cases, it can be called like getClass().getResourceAsStream(). I don't know what it is actually.
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Difference between MyClass.class and Class.forName("className")
(4 answers)
When does static initialization happen?
(3 answers)
How does Class.forName() work?
(4 answers)
What is a class literal in Java?
(10 answers)
Closed 3 years ago.
Class.forName() and Class.class both can get the Class object.What is the different of them?
I noticed that static method block don't execute when I got class object by Class.class.Is the class file not loaded by JVM yet?
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Synthetic Class in Java
(13 answers)
Closed 7 years ago.
I was going through the java Method.class (Decompiled) and I found something that caught my eye.
#Override
public boolean isSynthetic() {
return super.isSynthetic();
}
"Synthetic". What does that mean?
Is it usable in code?
.
And since I found this in the Method class, I was wondering, is it that an entire method could be "synthetic", or is it that it contains something synthetic?
Thanks in advance.
.
not a copy of What is the meaning of “static synthetic”?
Any constructs introduced by the compiler that do not have a
corresponding construct in the source code must be marked as
synthetic, except for default constructors and the class
initialization method.
http://www.javaworld.com/article/2073578/java-s-synthetic-methods.html
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Java: NoSuchMethodException when method clearly exists
(4 answers)
Closed 7 years ago.
I am trying to add static methods from an existing class to a HashMap. All the methods are located in the same class with the following code :
map.put("x", myClass.class.getMethod("addX"));
map.put("y", myClass.class.getMethod("addY"));
When I run the code I get java.lang.NoSuchMethodException: package.myClass.addX.
Any ideas?
You should use getDeclaredMethod() method instead of getMethod().
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super() in Java
(18 answers)
Closed 7 years ago.
public TableViewerTest() {
super(null);
model = new PlayerTableModel();
}
what does super(null) do here. I am new to java so was not able to figure out.
It calls the constructor of the super class with parameter null.
super(null) call a constructor of the super class of TableViewerTest which accepts a single reference type argument. It passes null to that constructor.