You want to pass command-line arguments to your code, or select a JRE for the current project only, or pass arguments to the JVM.
Say you’re trying to run the code in Example 4-4, Launcher.java
, which
reads command-line arguments, concatenates them, and displays the
results. If you don’t pass any command-line
arguments to this code, you get a
java.lang.ArrayIndexOutOfBoundsException
exception.
Example 4-4. Concatenation sample
package org.cookbook.ch04; public class Launcher { public static void main(String[] args) { String text =""; for (int loopIndex = 0; loopIndex <args.length; loopIndex++){ text += args[loopIndex] + " "; } System.out.println(text); } }
You can supply command-line arguments in the launch configuration for
this project by highlighting Launcher.java
in
the Package Explorer, selecting Run→ Run to open the Run
dialog, and clicking the New button to create a new launch
configuration for this project, as shown in Figure 4-20. The Main tab in this dialog enables you to
select the main class in a project. The Arguments tab enables you to
specify command-line and JVM arguments. The JRE tab enables you to
select the JRE for the project. And the Source tab enables you to
connect source code to your project for the debugger.
Type the words No
problem
.
in the
“Program arguments” box, as shown
in Figure 4-20. Then click Run, and the code will
read that command-line argument and display it, as shown in Figure 4-21.
Recipe 4.8 on selecting the Java runtime; Recipe 4.9 on running your code.
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