1. How to convert a string String into an integer int?
Method 1:
int i = ([String]);or i = ([String],[int radix]);
Method 2：
int i = (my_str).intValue();
What is the difference between these two methods? Is the function the same? Can it be interchanged under any circumstances?
Method 1:
// Use static methods directly, no unnecessary objects will be generated, but exceptions will be throwni = (s);
Method 2:
// (s) is equivalent to new Integer((s)), and will also throw exceptions, but will generate one more objecti = (s).intValue();
Note: The method of converting a string to Double, Float, Long is similar.
2. How to convert an integer int into a string String?
Method 1:
String s = (i);
Method 2:
String s = (i);
Method 3:
String s = "" + i;
What is the difference between these two methods? Is the function the same? Can it be interchanged under any circumstances?
Method 1:
// Two String objects will be generateds = i + "";
Method 2:
// Use the static method of the String class directly to generate only one objects = (i);
Note: Double, Float, Long The methods of converting to strings are similar.
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