How to convert numeric to string in JAVA

xibinhappy

How to convert a numeric type to a string in Java? What function is used?
For example, turn 1 into "01"

okok02

The very disgusting method is as follows (please ask for good methods):
int i = 9;
String strTemp = "";
if (i <= 9)
strTemp = "0" + i;
else
strTemp = "" + i;
System.out.print (strTemp);

king811221

String.valueOf (123); Simpler 123+ ""