Extract information about the current method in Java

Say you wish to get some simple information about the currently running function in your Java program. The stacktrace of the current thread can help you find that.

Here’s a simple snippet to print the class name, the file name, the line number and the method name:

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Create a List using Arrays.asList in Java

Java 8 has a number of new methods on Collections. One such utility method is the static asList method with which you can quickly create a List of T.

Here’s how it works for a List of integers:

List<Integer> asList = Arrays.asList(1,2,3,4);

…and for a List of strings:

List<String> asList = Arrays.asList("hello", "my", "dear", "world");

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Adjusting the date in Java Date and Time API

Introduction

We saw a couple of new concepts in the Java 8 Date and Time API on this blog:

All the above classes expose methods called “with” with a couple of overloads. LocalDate, LocalTime and LocalDateTime come with other methods whose names start with “with”, such as withSeconds or withMonth depending on the supported level of time unit. The “with” methods adjust some value of the date-related instances and return a new instance.

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Insert a non-existent value into a Map in Java

Consider the following Employee class:

public class Employee
{
    private UUID id;
    private String name;
    private int age;

    public Employee(UUID id, String name, int age)
    {
        this.id = id;
        this.name = name;
        this.age = age;
    }
        
    public UUID getId()
    {
        return id;
    }

    public void setId(UUID id)
    {
        this.id = id;
    }

    public String getName()
    {
        return name;
    }

    public void setName(String name)
    {
        this.name = name;
    }    
    
    public int getAge()
    {
        return age;
    }

    public void setAge(int age)
    {
        this.age = age;
    }
}

Let’s put some Employee objects into a hash map:

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Check available number of bytes in an input stream in Java

In this post we saw how to read the bytes contained in an input stream. The most common way to achieve it is by way of one of the read methods. The overloaded version where we provide a target byte array, an offset and a total byte count to be read is probably used most often.

It can happen in real-life situations that we provide the total number of bytes to be extracted but those bytes have not yet “arrived”, i.e. are not yet available in the input stream. This can occur when reading the bytes from a slow network connection. The bytes will eventually be available. The read method will block the thread it’s running in while it is waiting for the bytes to be loaded.

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Various ways to read bytes from an input stream in Java

Say you want to fill a byte array from a source, e.g. a from a randomly simulated data of 50 bytes like the following:

byte[] simulatedSource = new byte[50];
Random random = new Random();
random.nextBytes(simulatedSource);
InputStream inputStream = new ByteArrayInputStream(simulatedSource);  

At a basic level we can read each byte one by one from the input stream as follows:

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Time zones in the Java Date and Time API

Introduction

I know for a fact that all programmers love working with time zones. Chances are high that you, as a reader of this blog, are also a programmer so I bet you also just love time zones. Let’s see what Java 8 offers as far as time zones are concerned.

Time zones

So far in this series on the date and time in Java 8 we always worked with the local time zone found on your computer. All date-related classes, such as LocalTime or LocalDateTime allow you to easily set the time zone. Here’s an example with the LocalDateTime class:

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