1Z0-811 Exception Handling and Development Tools Practice Question
Which command is used to run a Java application from the command line?
⚠ Common exam trap
Oracle often tests the distinction between compilation (`javac`) and execution (`java`), trapping candidates who confuse the compiler with the runtime launcher.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
java
The `java` command is the correct tool to launch a Java application from the command line. It invokes the Java Virtual Machine (JVM) to load and execute the compiled bytecode contained in `.class` files or a JAR file. Without this command, the application cannot run.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
jar
Why it's wrong here
jar is for archiving.
- ✗
javac
Why it's wrong here
javac is the compiler.
- ✓
java
Why this is correct
java runs the JVM.
- ✗
javadoc
Why it's wrong here
javadoc generates documentation.
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JA
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