Statements in java

What is Statement in java:

A statement in java is an instruction that explains what will happen based on the condition.

Types of java statements:

There are different statements in java

• Expression statement
• Declaration statement
• Control flow statement

Expression statement:

An expression is used to generate a new value and we can also assign a new value to a variable. it is the combination of values, variables, operators, and methods calls.

There are three types of expressions in Java:

• The expression is used to produce a value. we should enclose the expression in the parentheses that will be evaluated first, after that rest of the expression which is present will be evaluated.
• Expressions are used to assign a new value to a variable.
• Expression is used to neither produces any result nor assign a value like an increment or decrement 
• expressions that produce a value use a high range of Java arithmetic, comparison, or conditional operators.
• arithmetic operators like +, *, /, <, >, ++ and %. Some conditional operators are like ||, and the comparison operators are like <, <= and >.

Example1:

// expression

number = 10

// statement

number = 10;

Example 2:

// expression

++number

// statement

++number;

Declaration statement:

Declare statements are used to declare the variable by specifying its data types and name.

Syntax:

Data_type variable_name = value; 

Example:

public class CreateVariable {
    public static void main(String[] args)   
{  
//variable declaration  
        int student_id = 10;  
        String student_name = "Java coder";  
        double numbers = 3.21;  
        Boolean shows = true;  
        System.out.println("Name:"+student_name+ "\nAge:" +student_id);  
        System.out.println("Number:"+numbers+ "\nBoolean:" +shows);  
    }  
}

Output:

Name: java coder
Age:10
Number:3.21
Boolean: true

Control statements:

Control statements are used to decide the flow of a java program. The control statements are used to interrupt a flow of control of a particular section of a program based on the condition.

Control statements are divided into different types

1. Conditional or Selection Statements
   • if Statement
   • if-else statement
   • if-else-if statement
   • switch statement
2. Loop or Iterative Statements
   • while Loop
   • do-while Loop
   • for loop
   • for each Loop
3. Flow Control or Jump Statements
   • Break
   • Continue
   • return

Example:

//declaring the statement  
int number;  
//expression statement  or initialising the value
number = 250; 
//control flow statement  
if (number > 50)  
{  
//expression statement  
System.out.println(number + " is greater than 100");  
}

Output:

250 is greater than 100