JAVA FLOW CONTROLS
FLOW CONTROL AND CLASSES
EXAMPLE
IF
public class MyClass
{
public static
void main(String[] args)
{
if (20 >
18)
{
System.out.println("20 is greater
than 18"); // obviously
}
}
}
OUTPUT
20 is greater than 18
IF
ELSE
—Use
the else statement to specify a block of code to be executed if the
condition is false.
Syntax
—if (condition)
{
// block of code to be executed if the condition is true
}
// block of code to be executed if the condition is true
}
else
{
// block of code to be executed if the condition is false
}
// block of code to be executed if the condition is false
}
IF
ELSE IF EXAMPLE
public class
gasc2
{
public static
void main(String args[])
{
int a=10;
if(a==10)
{
System.out.println("gobi");
}
else if(a<10)
{
System.out.println("arts");
}
}
}
OUTPUT
GOBI
BREAK
—You have already seen
the break statement used in an earlier chapter of this tutorial. It
was used to "jump out" of a switch statement.
—The break statement
can also be used to jump out of a loop.
—
BREAK
EXAMPLE
public class dog2
{
public static
void main(String args[])
{
int i;
for(i=0;i<5;i++)
{
if(i==3)
{
break;
}
System.out.println(i);
}
}
}
OUTPUT
0
1
2
CONTINUE
—The continue statement
breaks one iteration (in the loop).
— if a specified
condition occurs, and continues with the next iteration in the loop.
CONTINUE
EXAMPLE
public class dog2
{
public static
void main(String args[])
{
int i;
for(i=0;i<5;i++)
{
if(i==3)
{
continue;
}
System.out.println(i);
}
}
}
OUTPUT
0
1
2
4
SWITCH
CASE
—Use
the switch statement to select one of many code blocks to be
executed.
Syntax
—switch(expression)
{
case x:
// code block
break;
case y:
// code block
break;
default:
// code block
}
case x:
// code block
break;
case y:
// code block
break;
default:
// code block
}
—
EXAMPLE
SWITCH
—int day
= 4;
switch (day) {
case 1:
System.out.println("Monday");
break;
case 2:
System.out.println("Tuesday");
break;
case 3:
System.out.println("Wednesday");
break;
case 4:
System.out.println("Thursday");
break;
case 5:
System.out.println("Friday");
break;
case 6:
System.out.println("Saturday");
break;
case 7:
System.out.println("Sunday");
break;
}
// Outputs "Thursday" (day 4)
RETURN
KEYWORDswitch (day) {
case 1:
System.out.println("Monday");
break;
case 2:
System.out.println("Tuesday");
break;
case 3:
System.out.println("Wednesday");
break;
case 4:
System.out.println("Thursday");
break;
case 5:
System.out.println("Friday");
break;
case 6:
System.out.println("Saturday");
break;
case 7:
System.out.println("Sunday");
break;
}
// Outputs "Thursday" (day 4)
—The return keyword
finished the execution of a method, and can be used to return a value from a
method.
RETURN
KEYWORD EXAMPLE
—public class MyClass
{
static int myMethod(int x)
static int myMethod(int x)
{
return 5 + x;
}
public static void main(String[] args)
return 5 + x;
}
public static void main(String[] args)
{
System.out.println(myMethod(3));
System.out.println(myMethod(3));
}
}
Outputs 8 (5 + 3)
VOID
—The return keyword
finished the execution of a method, and can be used to return a value from a
method.
VOID
EXAMPLE
public class MyClass
{
static void myMethod()
static void myMethod()
{
System.out.println("I just got executed!");
}
public static void main(String[] args)
System.out.println("I just got executed!");
}
public static void main(String[] args)
{
myMethod();
myMethod();
}
}
—
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