Java Training Course/JT03: Difference between revisions
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* Create a file <code>DupString.java</code> with the following modified copy of the <code>HelloWorld</code> program: | ==Main Arguments and String Concatenation== | ||
In this session we will pass 2 parameters from the commandline to the program. There we will access, concatenate and output them. | |||
* Create a file <code>DupString.java</code> with the following modified copy of the <code>HelloWorld</code> program of session [[Java Training Course/JT02|JT02]]: | |||
public class DupString { | public class DupString { | ||
public static void main(String[] args) { | public static void main(String[] args) { | ||
| Line 9: | Line 11: | ||
} // main | } // main | ||
} // DupString | } // DupString | ||
* Compile the program to be sure that you entered it with the correct syntax. | * Compile the program in order to be sure that you entered it with the correct syntax. | ||
* Before running the program, tell what you would expect as output from the following command: | * Before running the program, tell what you would expect as output from the following command: | ||
java DupString Hello World | java DupString Hello World | ||
* Bonus task: How would you make the output more readable with little effort? | |||
[[Java Training Course/JT02|< Previous: JT02]] "Hello, World!"<br /> | |||
[[Java Training Course/JT04|> Next: JT04]] Integer Arithmetic | |||
Latest revision as of 09:50, 24 September 2017
Main Arguments and String Concatenation
In this session we will pass 2 parameters from the commandline to the program. There we will access, concatenate and output them.
- Create a file
DupString.javawith the following modified copy of theHelloWorldprogram of session JT02:
public class DupString {
public static void main(String[] args) {
String st0 = args[0]; // the 1st parameter on the commandline
String st1 = args[1]; // the 2nd ...
String st2 = st0 + st1;
st2 = st2 + st2 + st2 + st2;
System.out.println(st2);
} // main
} // DupString
- Compile the program in order to be sure that you entered it with the correct syntax.
- Before running the program, tell what you would expect as output from the following command:
java DupString Hello World
- Bonus task: How would you make the output more readable with little effort?
< Previous: JT02 "Hello, World!"
> Next: JT04 Integer Arithmetic