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java - (AND) and || (OR) in IF statements - Stack Overflow All the answers here are great but, just to illustrate where this comes from, for questions like this it's good to go to the source: the Java Language Specification Section 15:23, Conditional-And operator ( ) , says:
java - Setting active profile and config location from command line in . . . Option 1: Java System Properties (VM Arguments) It's important that the -D parameters are before your application jar otherwise they are not recognized java -jar -Dspring profiles active=prod application jar Option 2: Program arguments java -jar application jar --spring profiles active=prod --spring config location=c:\config
boolean operations - How to use or in Java? - Stack Overflow The || operator can only be used, in Java, where a boolean (true or false) expression is expected, such as in an if statement like the above So pretty much in an if or a conditional operator (that ? : thing, sometimes called the ternary operator)
What is the difference between == and equals () in Java? Since java lang String class override equals method, It return true if two String object contains same content but == will only return true if two references are pointing to same object Here is an example of comparing two Strings in Java for equality using == and equals() method which will clear some doubts:
java - SSL and cert keystore - Stack Overflow again, yes Java JDK tools can work with SSL self signed certs It also works in Windows 11 just use Oracle's JDK kit path C:\Program Files\Java\jdk-20\lib\security\cacerts tool path C:\Program Files\Java\jdk-20\bin\keytool I just drop the cert I need into the folder named security and run similar commands as the imac just different paths
java - How to run a JAR file - Stack Overflow java -jar myjar jar - is the default option to run application; java -cp my-class-path my-main-class or java -classpath my-class-path my-main-class; java --module-path my-module-path --module my-module my-main-class; Deployment to an enterprise server It's when you have war or ear file We'll omit the explanation for this case
in java what does the @ symbol mean? - Stack Overflow In Java Persistence API you use them to map a Java class with database tables For example @Table() Used to map the particular Java class to the date base table @Entity Represents that the class is an entity class Similarly you can use many annotations to map individual columns, generate ids, generate version, relationships etc
What does the arrow operator, - gt;, do in Java? - Stack Overflow Details: Java 6, Apache Commons Collection, IntelliJ 12 Update Answer: It turns out that IntelliJ 12 supports Java 8, which supports lambdas, and is "folding" Predicates and displaying them as lambdas Below is the "un-folded" code