How can I print a variable name in Java?

How can I print a variable name in Java?

1. public void printFieldNames(Object obj, Foo… foos) {
2. List fooList = Arrays.asList(foos);
3. for(Field field : obj.getClass().getFields()) {
4. if(fooList.contains(field.get()) {
5. System.out.println(field.getName());
6. }
7. }
8. }

Can we get variable name in Java?

A variable’s name can be any legal identifier — an unlimited-length sequence of Unicode letters and digits, beginning with a letter, the dollar sign ” $ “, or the underscore character ” _ “. The convention, however, is to always begin your variable names with a letter, not ” $ ” or ” _ “.

How do I print the name of an object?

1. If you have an object: object. getClass(). getName() will give you the fully qualified name of the object (i.e.package. className. For example, String thing = new String(); thing.
2. If you have a class name: className. class. getName() will give you the fully qualified name of the object (i.e.package. className.

Can we print address of variable in Java?

It is impossible to get an address of any primitive variable or object in Java. All that you can do is get default object hash code (which usually related to its address, but it is not guaranteed) with System. identityHashCode(a) .

What is the reflection in Java?

Reflection is a feature in the Java programming language. It allows an executing Java program to examine or “introspect” upon itself, and manipulate internal properties of the program. For example, it’s possible for a Java class to obtain the names of all its members and display them.

How do you find a variable in Java?

Use getClass(). getSimpleName() to Check the Type of a Variable in Java. We can check the type of a variable in Java by calling getClass(). getSimpleName() method via the variable.

How do you name an object in Java?

Objects/Variables: Java Naming convention specifies that instances and other variables must start with lowercase and if there are multiple words in the name, then you need to use Uppercase for starting letters for the words except for the starting word. This is called as lowerCamelCase.

What is print method in Java?

print(): print() method in Java is used to display a text on the console. This text is passed as the parameter to this method in the form of String. This method prints the text on the console and the cursor remains at the end of the text at the console.

How do you print an address in Java?

Strictly speaking, you can’t print the address of an object in pure Java. The number that looks like an object address in the String produced by Object. toString() is the object’s “identity hashcode”.

How do you print a reference string in Java?

How to print reference of String Object?

1. class MyClass{ public String toString(){
2. System.out.println( “Executing the toString()” ); return ( “returned from toString()” );
3. } public static void main(String[] args){
4. MyClass ob = new MyClass(); System.out.println(ob);
5. } }

How do you write a variable in JavaScript?

To output a value of a variable, simply place the variable name as an argument inside the document.write method, as: x = 50; The above JavaScript code creates a variable called x (line 2) and sets it equal to 50 (line 2). On line 3, we use the document.write () method to print the value of the variable x to the screen.

How to create a string variable Java?

To set up a string variable, you type the word String followed by a name for your variable. Note that there’s an uppercase “S” for String. Again, a semicolon ends the line: String first_name; Assign a value to your new string variable by typing an equals sign. After the equals sign the text you want to store goes between two sets of double quotes:

How do you declare a string variable in Java?

To declare a variable in Java, all that is needed is the data type followed by hte variable name: int numberOfDays; In the above example, a variable called “numberOfDays” has been declared with a data type of int. Notice how the line ends with a semi-colon.

What are the types of variables in Java?

Variable is a name of memory location. There are three types of variables in java: local, instance and static. There are two types of data types in java: primitive and non-primitive. Variable is name of reserved area allocated in memory.