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Flow Control and Exception Handling - Statements
| Java Statements (JJ pg108) | ||
| Statement | Description | |
| empty | consists of ; and performs no operation | |
| block | group of statements enclosed in {}. Treated as a single statement when used with other statements
{ x +=y;
if( x < 10 )
return y;
}
|
|
| declaration | declares a variable with a particular type and optionally assigns a value: int x = 10; | |
| labeled | any statment may be labled using identifier:
startLoop:
for( ;; ){}
|
|
| assignment | evaluates an expression and assigns the result to a variable: x = y + z; | |
| invocation | calls an object method: s.toString(); | |
| return | returns a value from a method call: return x; | |
| Object creation | creates a new instance of a given class: String s = new String("abc"); | |
| if..else | selects between two alternatives
if( a==b )
// do this
else
// do this
|
|
| switch | selects from various alternatives
switch( a ) {
case 1:
case 2:
case 3:
default:
|
|
| for | executes a set of statements for a defined number of iterations
for( int i=0; i<10; i++ ) {
// do this
}
|
|
| while | executes a block of statements while a condition is true
while( !done ) {
// do this
}
|
|
| do | executes a block of statments while a condition is false
do {
// this
}while( !done );
|
|
| break | transfers the flow of control to a labeled block or out of an enclosing statement | |
| continue | forces a loop to start the next iteration | |
| try-catch-finally | catches and processes exception errors that occur during the execution of a given block of code
try {
// some operation
} catch (Exception e) {
// handle the exception
} finally {
// do this
}
|
|
| throw | throw an exception | |
| synchronized | gets a lock on an object and executes a statement block
synchronized(obj){
obj.setProperty(x);
}
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|
