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I have created a windows application using java 8 . But my client is using java 7 on his machine and not able to upgrade java on the machine.
So when i run jar on java7 compiled in java 8 it gives error so can i convert jar compatible to lower version java
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Binary CompatibilityJava SE 8 is binary-compatible with Java SE 7 except for the incompatibilities listed below. Except for the noted incompatibilities, class files built with the Java SE 7 compiler will run correctly in Java SE 8.
For standard code, yes, it still works, but there are a few enterprise libraries that you can no longer rely on having present.
Go to Window -> Preferences -> Java -> Compiler and there you can change the Java version. This way, you can update your PC to Java 8 and you'll have no problem with the older projects. Well, first of all you have to install Java 8. Then, you'll have the option to select the 1.8 version.
You may have to restart your computer for Java to be fully implemented. Double-click the JAR file. If it's executable and you have Java installed, it should open. If it doesn't open, proceed to the next step. You may see a pop-up window asking which program you want to use to open the file. If so, click Java (TM) and then click OK.
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The following example shows how to compile and run Java program in command line mode with external jars. It is developed under Linux. 1. Compile & Run Java Program Without External Jar Let's create a simple hello world program "helloworld.java". public class helloworld { public static void main (String[] args){ System. out. println("Hello!"); } }
This wikiHow teaches you how to open and run executable JAR files on a Windows or Mac computer. JAR (Java Archive) files contain data to be used with the Java program.
You can't change a compiled jar's Java version. You have 2 option in hand.
Compile the Source code using Java-7.
Compile source code using Java-8 but using the following command when target vm version is java-7.
javac "Your java classes" -source 1.8 -target 1.7
Java 7 is forward compatible with Java 8. Java 8 can be compiled so that it runs on a Java 7 VM (with -source 7 -target 7), but you can’t use any of the newer APIs. Just Compile with JAVA 7 and you would be good to go just make sure you are not using new features of java 8 like lamda
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