I want to create my own custom function in java which work exactly same like the printf . Like
printf("My name is %c ,my age is %d","B",23);
Which will return My name is B , My age is 23 . or
printf("No of items %d",2);
which will return No of items 2.
need help
There are multiple such methods in Java.
String.format(String, Object...)
Returns a formatted string using the specified format string and arguments.
and
System.out
can use PrintStream.printf(String, Object...)
and
Formatter
syntax applies to both of the above For example,
String fmt = "i = %d%n";
int iv = 101;
System.out.print(String.format(fmt, iv));
System.out.printf(fmt, iv);
Formatter out = new Formatter(System.out);
out.format(fmt, iv);
out.flush();
Outputs
i = 101
i = 101
i = 101
Use "%s" for a String
and System.out.printf
like
System.out.printf("My name is %s,my age is %d%n", "B", 23);
System.out.printf("No of items %d%n", 2);
Output is (as requested)
My name is B,my age is 23
No of items 2
You can go for System.out.printf(). it acts same like as printf function in c.
you can code this way.. please share the feedback, as I tried some happy cases only.
public class Test1 {
public static void main(String[] args) {
printf("My name is %s ,my age is %d","B",23);
}
public static void printf(final String in, final Object... args) {
System.out.println(String.format(in, args));
}
}
Output : My name is B ,my age is 23
We can use
System.out.print("My name is "+"B"+",my age is " +23);
or
System.out.print("No of items "+2);
String name = "B";
int age = 23;
System.out.printf("My name is %s, My age is %d", name,age);
System.out.println();
System.out.printf("No of items %d", 2);
Output:
My name is B, My age is 23
No of items 2
创建像function(String line,Object ... args)这样的函数
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