lambda Expression

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What is lambda expression for?

Example:

only one method in this interface

public interface FileFilter(){

pblic boolean filter(File file);

}

Ways to use this interface:

By implementing this interface

public class File implements FileFilter{

@override

public void boolean filter(){

return true;

}

}

File f=new File();

f.filter(f);

2. By making anonymous class

public class File{

FileFilter f=new FileFilter(){

@override

public boolean filter(){

return true;

}

}

}

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To make instance of anonymous inner class easier to write and read.

Another way to write instances for anonymous java inner class.

FileFilter f=(File file) -> true;

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Practical Example for Lambda implementation

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Example with Runnable interface.

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Lambda with Comparators:

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More on Functional interface:

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