在java帮助中格式化输出

Question

Was wondering if anyone can further guide me as far as using width specifiers to making my output look like this using the static string format method ONLY.

ID: 1122

Created: 03/05/14

Owner: Sam Williams

Opening Balance: $14600.0

Annual Rate: 4.5

Withdraw: 5400.0

Current Balance: $14600.0

Currently, my output is this (using tabs and new lines)

ID: 1122

Created: 03/05/14

Owner: Sam Williams

Opening Balance: $14600.0

Annual Rate: 4.5

Withdraw: 5400.0

Current Balance: $ 14600.0

JAVA CODE CURRENTLY IS:

System.out.println("ID:\t\t " + a.getId());
System.out.println("Created:\t" + String.format("%tD", a.getDateCreated()));
System.out.println("Owner:\t\t" + "" + a.getOwner() +
"\nOpening Balance: $" + a.getBalance() + "\nAnnual Rate:\t" + a.getAnnualRate() +"\nWithdraw:\t" + withDrawal +"\nCurrent Balance:\t" + " $ " + String.format("%.2f", a.getBalance()));

Answer 1

You can use format method in java. It looks something like:

System.out.format("The Name is of %d is %f.%n", i, r);

format method

Edited: The general syntax is: %[flags][width][.precision][argsize]typechar

And it will work with all the datatypes. It is an analogy of format specifier in C.

Answer 2

You'd better learn the basic usage of String formatting in Java like decimal, float, string, date and time .

For example you can do like this with your first line:

System.out.println(String.format("ID:%12d" , a.getId()));

Here 12 is the max length if id , if your length(id) < 12 then some space will be insert on left .