- 1). Surround code with try and catch statements. To use internal exceptions through Java, code needs to be enveloped in try and catch statements. The example below is the syntax used:
try {
Code used to process application processes.
}
catch {
There was an error. Throw an exception.
} - 2). Write your code within the try and catch blocks. Placing code within the try block passes an error to the catch block. For instance, if you attempt to save a string into an integer variable, the compiler catches the error for the programmer to handle.
try {
int myInt;
string myString = "";
myInt = myString; //This throws an error to the catch block
}
}
catch
{
//error code
} - 3). Write the exception code. When an error is caught, return the error text to the user.
try {
int myInt;
string myString = "";
myInt = myString; //This throws an error to the catch block
}
}
catch
{
System.out.println("An integer cannot hold a string variable!");
} - 4). Throw an exception. You may want to throw your own exception class. You can use a specific user-defined function by using the "throw" keyword. The code below tests the value of a variable and throws an error if the number equals zero.
int myNumber = 0;
if (myNumber == 0) {
throw new BadNumber();
}
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