They are basically used to group related classes.
The supermost package of Java is the "java" package.
a package
The Java 'this' installation package allows one to create installation programs for their Java based applications. One can download the program from Java.
A default package is a package with no name. You can create a Java class without putting package name on top of the code. This class is included in the "default package". Be careful not to be confused with java.lang, which is a package that contains Java's fundamental classes and get's imported by default.
The java.lang package is automatically imported for you.
The java.lang package in Java is automatically imported for you.
A user defined package is a package outside of the standard Java libraries.
You can import a package as many times as you want in Java. The compiler will just ignore any duplicates.
Yes it is possible to draw in java by using AWT package. or by using javax package.
You use javac <filename> to compile a class or package.
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java.lang defines the core Java language, without which all of Java would fail to operate. It is therefore the default package that must be used with every program that will run Java, as it contains all of the logic necessary for exception handling, threads, classes that represent primitives (and their associated logic), and so on.