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java Arrays.sort 2d array

Use Overloaded Arrays#Sort(T[] a, Comparator c) which takes Comparator as the second argument. JAVA-8: Instead of that big comparator, we can use lambda function as following-

Convert character to ASCII numeric value in java

Very simple. Just cast your char as an int. In your case, you need to get the specific Character from the String first and then cast it. Though cast is not required explicitly, but its improves readability.

Exception in thread “main” java.lang.OutOfMemoryError: Java heap space

I have written a code and I run it a lot but suddenly I got an OutOfMemoryError:

Server Tomcat v9.0 Server at localhost failed to start

I am using Eclipse Neon and Tomcat server 9.0 and JDK 1.8 It was working well but unfortunately its giving me error ‘Server Tomcat v9.0 Server at localhost failed to start.’ I tried to change the ports i.e. connection port and other ports too but it did not solve my problem and this error is … Read more

What is the Java ?: operator called and what does it do?

Yes, it is a shorthand form of It’s called the conditional operator. Many people (erroneously) call it the ternary operator, because it’s the only ternary (three-argument) operator in Java, C, C++, and probably many other languages. But theoretically there could be another ternary operator, whereas there can only be one conditional operator. The official name is given in the Java Language … Read more

Java – No enclosing instance of type Foo is accessible

static class Thing will make your program work. As it is, you’ve got Thing as an inner class, which (by definition) is associated with a particular instance of Hello (even if it never uses or refers to it), which means it’s an error to say new Thing(); without having a particular Hello instance in scope. If you declare it as a static class instead, … Read more

Declaring an unsigned int in Java

Java does not have a datatype for unsigned integers. You can define a long instead of an int if you need to store large values. You can also use a signed integer as if it were unsigned. The benefit of two’s complement representation is that most operations (such as addition, subtraction, multiplication, and left shift) are identical on a binary level for … Read more

Java – Best way to print 2D array?

I was wondering what the best way of printing a 2D array was. This is some code that I have and I was just wondering if this is good practice or not. Also correct me in any other mistakes I made in this code if you find any. Thanks!

Java Method Call Expected

incListener and declListener are classes, not methods. Try btw, rename your classes names to make them start with an uppercase

Received fatal alert: handshake_failure through SSLHandshakeException

The handshake failure could have occurred due to various reasons: Incompatible cipher suites in use by the client and the server. This would require the client to use (or enable) a cipher suite that is supported by the server. Incompatible versions of SSL in use (the server might accept only TLS v1, while the client … Read more

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