How to convert java string array to string with delimiter

Using String.join method (from java 8)

Using simple for-loop expression


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How to convert an int to a formatted string in java

Using java.util.formatter

See the Formatter docs for other modifiers.

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How to check If a String is an Integer in Java

Suppose we have the following problem. User input some value, how to check that this value is a String is an integer: 1. Check by Exception

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Output data to excel file by template with jxls

Let’s assume we have a Java collection of Car objects that we want to output into Excel. The Car class may look like this

To use Jxls to output …

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