Java Community | Help. Code. Learn.•2d ago

centralising column header

Heys guys can someone tell my why this isnt centralised and how i can centralise it

14 Replies

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kkeiiiiOP•2d ago

//Display the table of invoices using Invoice toString().
        //Print table header.
        System.out.println("Part number\tPart description\tQuantity\tPrice per item\tValue");
        invoices.stream()
                .forEach(System.out::print);
        
        //a)Use streams to sort Invoice object by partDecsription, then display the results.
        System.out.println("\nInvoices sorted by Part description\nPart number\tPart description\tQuantity\tPrice per item\tValue");
        invoices.stream().sorted(Comparator.comparing(Invoice::getPartDescription)).forEach(System.out::print);  
        
        //b)Use streams to sort Invoice object by price, then display the results.
        System.out.println("\nInvoices sorted by Price\nPart number\tPart description\tQuantity\tPrice per item\tValue");
        invoices.stream().sorted(Comparator.comparing(Invoice::getPricePerItem)).forEach(System.out::print);
        
        //c)Use streams to map each Invoice to its partDescription and quantity, 
        //  then display the results.
        System.out.println("\nPart Description and Quantity for each Invoice\nPart description\tQuantity");
        invoices.stream().sorted(Comparator.comparing(Invoice::getQuantity))
        .map(invoice -> String.format("%-20s %d\n", invoice.getPartDescription(), invoice.getQuantity()))
        .forEach(System.out::print);

//Display the table of invoices using Invoice toString().
        //Print table header.
        System.out.println("Part number\tPart description\tQuantity\tPrice per item\tValue");
        invoices.stream()
                .forEach(System.out::print);
        
        //a)Use streams to sort Invoice object by partDecsription, then display the results.
        System.out.println("\nInvoices sorted by Part description\nPart number\tPart description\tQuantity\tPrice per item\tValue");
        invoices.stream().sorted(Comparator.comparing(Invoice::getPartDescription)).forEach(System.out::print);  
        
        //b)Use streams to sort Invoice object by price, then display the results.
        System.out.println("\nInvoices sorted by Price\nPart number\tPart description\tQuantity\tPrice per item\tValue");
        invoices.stream().sorted(Comparator.comparing(Invoice::getPricePerItem)).forEach(System.out::print);
        
        //c)Use streams to map each Invoice to its partDescription and quantity, 
        //  then display the results.
        System.out.println("\nPart Description and Quantity for each Invoice\nPart description\tQuantity");
        invoices.stream().sorted(Comparator.comparing(Invoice::getQuantity))
        .map(invoice -> String.format("%-20s %d\n", invoice.getPartDescription(), invoice.getQuantity()))
        .forEach(System.out::print);

dan1st•2d ago

This is because of the way \t works

kkeiiiiOP•2d ago

i see Because it only has 2 columns?

dan1st•2d ago

It more or less adds spaces until it reaches one of a few column widths e.g. one divisible by 4

kkeiiiiOP•2d ago

ohh so how do i fix it

dan1st•2d ago

you could not use \t at all and use %s with a length specifier (idk the actual name) for everything so you specify a length for all elements

kkeiiiiOP•2d ago

i see

dan1st•2d ago

or in this case, it might work if you add a \t before the %d or 3 spaces though note that the amount of space you get from \t depends on the system

kkeiiiiOP•2d ago

Lets say i want every column to be centralised no matter the system So if i replace /t with %s10 will that work?

dan1st•2d ago

then don't use \t well not just replacing you would need to actually use String.format (or similar, e.g. System.out.printf) and then you'd need to use the corresponding format strings with the text passed as additional arguments

kkeiiiiOP•2d ago

got it thanks

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