java - Random integer from an array -

i'm new java , i'm practicing skills using multiple classes , using system.out.println.

i'm trying make program in have 'conversation' computer. i'd try , instead of computer having same age every time console run, use array list load of random ages, randomly selected. in computer class i've got:

    static int [] compage = {19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31}; 

and in main conversation class, i've got:

int uage = input.nextint(); // (uage user age) system.out.println("that's cool! you're " +uage+ ". i'm " + (computers age here) + " myself. live?"); 

i've read around bit , found code such as

compage[new random().nextint(compage.length)] 

but in knowledge of arrays , using random function (i have imported it) limited , i'm not sure go.

any massively appreciated. all.

compage[new random().nextint(compage.length() )] 

the new random().nextint() generates random positive number. if use compage.length(), set max value (exclusively, not picked ever).

that way, random age everytime start program.