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Introduction
Java is one of the most popular programming languages. If you are a Java developer, then you have definitely worked with binary operators. A binary operator is an operator which requires two operands. The operators, such as Arithmetic operators, Logical operators, Relational operators, etc., come under the category of Binary operators. Sometimes while working with binary operators, they give bad operand types error.
In this blog, we will discuss about the error bad operand types for binary operators, how they occur and how to resolve them. But before discussing the error, let’s discuss the different binary operators used in Java.
What are the Binary Operators Used in Java?
A binary operator is an operator which requires two operands. The binary operators that are frequently used in Java are:-
Bad operand types error is a compile time error that occurs when the types of operands are incompatible. For example, if we are performing a logical AND operation on an integer and boolean value, it will result in bad operand types error. In some cases, the bad operand types error occurs due to the precedence of operators that eventually leads to incompatible types. We will discuss four basic examples to understand the error bad operand types for binary operator, how they occur and how to resolve them.
Bad Operand Types for Logical AND (&&) Operator
Let’s understand with an example how bad operand types errors occur due to logical AND (&&) operator. Practice it on online java compiler.
public class CodingNinjas {
public static void main(String args[]) {
int num = 50;
if((num > 30) && (num * 10)){
System.out.println("Executing if block.");
}
else{
System.out.println("Executing else block.");
}
}
}
You can also try this code with Online Java Compiler
Reason for Error: This error occurs because the && operators work on two boolean operands. Here, (num>30) is a boolean operand, but the (num * 10) is an integer that leads to the error.
Resolving Error: To resolve the above error, we need to change the type of the operand (num * 10) from integer to boolean. So we will modify it to (num * 10 == 50) and make it boolean.
Let’s see what the code looks like after resolving the error:
public class CodingNinjas {
public static void main(String args[]) {
int num = 50;
if((num > 30) && (num * 10 == 50)){
System.out.println("Executing if block.");
}
else{
System.out.println("Executing else block.");
}
}
}
You can also try this code with Online Java Compiler
Reason for Error: This error occurs because the == operators work on the same type of operands. Here, num is an integer operand, but the str is a string that leads to the error.
Resolving Error: To resolve the above error, we need to change the type of the operand str from string to integer in the if statement. So we will modify it to Integer.parseInt(str) and make it an integer for comparison.
Let’s see what the code looks like after resolving the error:
public class CodingNinjas {
public static void main(String args[]) {
int num = 500;
String str = "500";
if(num == Integer.parseInt(str)){
System.out.println("Executing if block.");
}
else{
System.out.println("Executing else block.");
}
}
}
You can also try this code with Online Java Compiler
Let’s understand with an example how bad operand types errors occur due to the & operator in java.
public class CodingNinjas {
public static void main(String args[]) {
int num = 50;
if( num & 55 == 25){
System.out.println("Executing if block.");
}
else{
System.out.println("Executing else block.");
}
}
}
You can also try this code with Online Java Compiler
Reason for Error: This error occurs because the precedence of the == operator is more than that of the & operator. Due to this, 55 == 25 is evaluated first, which gives us a boolean value. After the evaluation of 55 == 25 as a boolean, the first operand num is an integer. Since both the operands will become of different types, the & operator cannot work and results in an error.
Resolving Error: To resolve the above error, we just need to apply the parenthesis on the num & 55. So we will modify it to (num & 55), so the evaluation of this will be done first.
Let’s see what the code looks like after resolving the error:
public class CodingNinjas {
public static void main(String args[]) {
int num = 50;
if( (num & 55) == 25){
System.out.println("Executing if block.");
}
else{
System.out.println("Executing else block.");
}
}
}
You can also try this code with Online Java Compiler
Reason for Error: This error occurs because the >= operators work on the same type of operands. Here, num is an integer operand, but the str is a string that leads to the error.
Resolving Error: To resolve the above error, we need to change the type of the operand str from string to integer in the if statement. So we will modify it to Integer.parseInt(str) and make it an integer for comparison.
Let’s see what the code looks like after resolving the error:
public class CodingNinjas {
public static void main(String args[]) {
int num = 75;
String str = "75";
if(num >= Integer.parseInt(str)){
System.out.println("Executing if block.");
}
else{
System.out.println("Executing else block.");
}
}
}
You can also try this code with Online Java Compiler
Java is also one of the oldest and most popular programming languages. Java is an object-oriented programming language. It is used for back-end, front-end, software development, etc.
What is a binary operator?
A binary operator is an operator which requires two operands. The operators, such as Arithmetic operators, Logical operators, Relational operators, etc., come under the category of Binary operators.
What is Bad operand types error in Java?
Bad operand types error is a compile time error that occurs when the types of operands are incompatible.
What are the different operators in Java?
The different operators that are present in Java are Arithmetic Operators, Relational Operators, Logical Operators, Bitwise Operators, etc.
What is a Shell/Terminal?
Shell/Terminal is an interactive application/tool that helps to interact with the Operating System and allows us to write commands for doing various tasks.