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The Java if statement is used to test the condition. There are various types of statement in java.

• If statement – In this statement, the expression is a boolean expression(returns true or false).
• if(condition)
  {
  //code to be executed
  }
• If-else statement – This statement also test the condition and it executes the if block if the condition is true otherwise else block is executed.
• if(condition)
  {
  //code to be executed if condition is true
  }
  else
  {
  //code to be executed if condition is false
  }
• if-else-if statement – The if-else if ladder statement executes one statement from multiple conditions.   
• if(condition1)
  {
  //code to be executed if condition1 is true
  }
  else if(condition2)
  {
  //code to be executed if condition2 is true
  }
  else if(condition3)
  {
  //code to be executed if condition3 is true
  }
  else
  {
  //code to be executed if all the conditions are false
  }

class If1
{
public static void main(String args[])
{
int age=24;
if(age>18)
{
System.out.println("You are eligible to vote");
}
}
}  
Output:
You are eligible to vote

class If2
{
public static void main(String args[])
{
int a=2016;
if(a%4==0)
{
System.out.println("Leap year");
}
else
{
System.out.println("Not a leap year");
}
}
}
Output:
Leap year

class If3
{  
public static void main(String args[])
{  
int marks=60;  
      
if(marks<=33)
{  
System.out.println("fail");  
}  
else if(marks>=34 && marks<=50)
{  
System.out.println("D grade");  
}  
else if(marks>=51 && marks<=70)
{  
System.out.println("C grade");  
}  
else if(marks>=71 && marks<=80)
{  
System.out.println("B grade");  
}  
else if(marks>=81 && marks<=90)
{  
System.out.println("A grade");  
}
else if(marks>=91 && marks<=100)
{  
System.out.println("A+ grade");  
}
else
{  
System.out.println("Invalid!");  
}  
}  
}  
Output:
C grade