Java Programming Language

This article is a part of the Java Programming Language article series. Contents Walking the File Tree Finding Files Watching a Directory for Changes Walking the File Tree The FileVisitor Interface Specifies the required behavior at key points in the traversal process A simple implementation: the SimpleFileVisitor class Key points When a file is visited…

This article is a part of the Java Programming Language article series. Purpose Improve the readability of the software File Organization Files longer than 2000 lines should be avoided Beginning Comments Package and Import Statements Indentation 4 spaces should be used as the unit of indentation Spaces vs tabs Line Length Avoid…

This article is a part of the Java Programming Language article series. Algorithms Sorting Shuffling Routine Data Manipulation Searching Composition Finding Extreme Values Sorting Reorders a List in ascending order Uses merge sort algorithm The sort method: Collections.sort(list); Collections.sort(list, comparator); Shuffling The opposite of sort In all possible permutations with equal likelihood Useful…

This article is a part of the Java Programming Language article series. JDK 8 and later, the preferred method of iterating over a collection is to obtain a stream and perform aggregate operations on it. A for-each loop The aggregate operation forEach Pipeline A sequence of aggregate operations Pipeline Components A source Zero or more intermediate operations A…

This article is a part of the Java Programming Language article series. Method References Refer to the existing method by name Person class Sort the array by age The sort method signature Lambda expression The Comparator interface is a functional interface Method reference Summary Lambda expression: (a, b)…

This article is a part of the Java Programming Language article series. JDBC Java API for database access A separate JDBC driver is used for each system Database A collection of data Table Database objects that contains the data Has rows and columns Rows: records Columns: field in the record

This article is a part of the Java Programming Language article series. Lambda Expressions Treat functionality as method argument, or code as data For anonymous class implementations Looks a lot like a method declaration Consider as anonymous methods: methods without a name Syntax of Lambda Expressions A comma-separated list of parameters enclosed in parenthese Omit the…

This article is a part of the Java Programming Language article series. Contents Read, Write, and Create File Random Access Files Create and Read Directories Links, Symbolic or Otherwise Other Useful Methods Legacy File IO Reading, Writing, and Creating Files

This article is a part of the Java Programming Language article series. Contents Versions NIO.2 Path Path Operations Check, Delete, Copy, and Move a File or Directory Managing Metadata (File and File Store Attributes) Versions