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In java persistence api you use them to map a java class with database tables Set the value of the environment variable to your jdk (or jre) installation path as follows: For example @table () used to map the particular java class to the date base table

@entity represents that the class is an entity class Open command prompt as administrator Similarly you can use many annotations to map individual columns, generate ids, generate version, relationships etc.

In the following link it gives the following explanation, which is quiet good to understand it

A ternary operator is some operation operating on 3 inputs In perl/php it works as: While hunting through some code i came across the arrow operator, what exactly does it do I thought java did not have an arrow operator

0 in java, == and the equals method are used for different purposes when comparing objects Here's a brief explanation of the difference between them along with examples The == operator is used for reference comparison It checks whether two references point to the exact same object in memory

String str1 = new string.

For example, i have tried writing something like this. How do i configure the tcp/ip port listened on by a spring boot application, so it does not use the default port of 8080. 7 it is the bitwise xor operator in java which results 1 for different value of bit (ie 1 ^ 0 = 1) and 0 for same value of bit (ie 0 ^ 0 = 0) when a number is written in binary form The binary representation of 5 is 0101

The binary representation of 4 is 0100. The flag xmx specifies the maximum memory allocation pool for a java virtual machine (jvm), while xms specifies the initial memory allocation pool This means that your jvm will be started with xms amount of memory and will be. I was running it from eclipse and not command line till now

Java_home if you installed the jdk (java development kit) or jre_home if you installed the jre (java runtime environment)

In the variable value field, enter your jdk or jre installation path

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