Using multiple .jar with javac
pardon my terminology. I'm trying to use three jar files with a java program for my CS class. The first is funjava, a simplified java language, and the others are class definitions color and geometry. Here is my code and what happens when I try to run it.
import colors.*;
class Canvas{
public static void main(String [] args){
System.out.println("test123");
Circle cr1 = new Circle( new Posn(1,2), 5, "blue");
Circle cr2 = new Circle( new Posn(5,4), 3, "red");
}
}
class Circle{
Posn center;
int rad;
String color;
Circle(Posn p, int r, String c){
this.center = p;
this.rad = r;
this.color = c;
}
}
class Posn{
int x;
int y;
Posn(int x, int y){
this.x = x;
this.y = y;
}
}
The last argument of Circle should be a color from the colors.jar, not a string.
niko@niko-laptop:~/Classes/Fundies2$ javac -cp *.jar Canvas.java
error: Class names, 'funjava.jar,geometry.jar', are only accepted if annotation processing is explicitly requested
1 error
niko@niko-laptop:~/Classes/Fundies2$ ls
1-20-10.java 1-21-10.java Book.class Canvas.class Circle.java Examples.class funjava.jar hw1~ Main.java OceanWorld.java
1-21-10 Author.class book.java Canvas.java colors.jar Examples.java geometry.jar Ishape OceanWorld Posn.class
1-21-10~ Author.java Book.java Circle.class Combo.java Fundies2.txt hw1 Main.class OceanWorld~ Rect.java
So how do I explicitly request annotation processing? Thank开发者_开发知识库 you.
In addition to Romain Muller's answer:
If you want to quickly use all of the *.jar files in the current directory, and you're using JDK 6 or later, you can use a single-asterisk. In a unix shell (like in Linux), you'll need to escape the asterisk:
javac -cp \* Canvas.java
This works when running the Java application as well:
java -cp .:\* Canvas
Note the .:
to tell Java to look in the current directory as well as the *.jar files to find Canvas.class
.
On Windows, use a semicolon (;
) instead of a colon as a separator.
As far as I know, the -cp option requires classpath to be specified as a colon or semi-colon-separated list of places in most situations, and not a comma-separated list as your OS seems to derivate when expanding *.jar
.
I am not sure why, but for me (on windows 10, java 17), the only thing that worked was:
javac -cp .;* Canvas
With semi-colon, and without the \
that exists in @ZoogieZork answer
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