fuck! the way you have choosen,please not give up.i don't like this subject now!what fuck!
One .write the common Exception name!
1.NullPointerException
2.ArrayIndexOutOfBoundsException
3.ArithmeticException
4.RuntimeException
5.ClassCastException
second .write member method limited ways
public protected private final static abstract default
third, the ways transfrom int into String
String s = " " + 10
String s = new Integer(10).toString();
String s = Integer.toString(10);
String s = String.valueOf(10);
fourth,the ways transfrom String into Int
int i = Inerger.parseInt("10");
int i = new Integer("10");