Why a single java source file can not have more than one public class?

So the reason behind keeping one public class per source file is to actually make the compilation process faster because it enables a more efficient lookup of source and compiled files during linking (import statements).

Why is my java program not compiling?

It means that javac.exe executable file, which exists in bin directory of JDK installation folder is not added to PATH environment variable. You need to add JAVA_HOME/bin folder in your machine’s PATH to solve this error. You cannot compile and run Java program until your add Java into your system’s PATH variable.

How many public classes can a .java file is allowed to have?

one public class
java file can contain only one public class. If you want these two classes to be public they have to be put into two .

Why the Java file name should be always the same as a public class name?

The filename must have the same name as the public class name in that file, which is the way to tell the JVM that this is an entry point. In this condition, we will not able to easily identify which class need to interpret by java interpreter and which class containing Entry point for the program.

Can there be multiple public classes in one Java file?

Long story short: no, you can’t put two public classes in one file because the compiler wouldn’t be able to handle that correctly.

Can we have two classes declared with same in java?

Yes, we can have multiple classes in same java file. But, there is one restriction over here, which is that you can have as many classes in one file but only one public class is allowed. If we try to declare 2 classes as public in the same file, the code will not compile.

Can a java file have two public classes?

No, while defining multiple classes in a single Java file you need to make sure that only one class among them is public. If you have more than one public classes a single file a compile-time error will be generated.

Can we compile a java file with a different name than class?

yes, we can compile a java file with a different name than the class, provided that there should not be any public class in that file. If there is any public class in file then in that case you have to give that name as file name.

Why the java file name should be always the same?

Why the java file name should be always the same as a public class name? In Java, the java file name should be always the same as a public class name. While writing a java program first it is saved as a ” .java ” file, when it is compiled it forms byte code which is a ” .class ” file as such that if we made our program file similar to

Why can’t I use a different file name for public classes?

In the case of a public class, we can’t use a different file name. The filename must have the same name as the public class name in that file, which is the way to tell the JVM that this is an entry point.

What is a Java source file without a public class called?

Java compilation of a .java file without a public class. Okay, so a java source file must have at least one public class and the file should be called “class-name.java”. Fair enough.