how to add try and catch validation and how to fix my switch, do-while error java -

i cant post code in here not sure why error post on reddit

https://www.reddit.com/r/javahelp/comments/3izvy2/how_to_add_try_and_catch_validation_and_how_to/

your try/catch syntax fine, what's problem?

however, do/while wrong, see while way down there, remove last curly bracket , put right before while:

do{       try{     system.out.println("choose option");    system.out.println("  1. create list of used car");   system.out.println("  2. print list of used car");   system.out.println("  3. search ");   system.out.println("  4. exit");    int choose = read.nextint();        if ( choose <= 4){            throw new exception();     }    }catch (exception e){   system.out.println("please enter input option 1-4");  ..rest of code... }while(choose <= 4); 

and in switch, choose not avaliable - choose local variable try/catch only, nothing other try/catch can access it. best make choose global variable putting @ top of do:

do{     int choose;     ..blah blah.. } 

and reference without int - choose:

choose = read.nextint(); 

finally, need break @ end of every case, , what's point of returns?:

case 1:   for(int i=0; i<a.length; i++){  system.out.print("enter model: "); model = read.next(); system.out.print("enter plate number: "); plateno = read.next(); system.out.print("enter manufactured year: "); manufacturedyear = read.nextint(); system.out.print("enter transmission type: ");    transmissiontype = read.next(); system.out.print("enter color: ");  color = read.next();  carlist used = new carlist(model, plateno, manufacturedyear,        transmissiontype, color); a[i] = used;         return; } break;  ...keep on going.... 

you shouldn't rely on others fix simple syntax problems, don't panic when error, go through code , learn how debug messages!