How to use conditional statements in Java to make logical judgments

How to use conditional statements in Java to make logical judgments requires specific code examples

Conditional statements are commonly used tools in programming, which enable the program to perform different operations according to needs branch execution. In Java programs, conditional statements can be used to determine the next action of the program based on the truth or falsehood of a certain condition. This article will introduce the use of conditional statements in Java and give specific code examples.

In Java, there are two main forms of conditional statements: if statements and switch statements.

1. if statement
   The if statement is one of the most commonly used conditional statements. It uses a condition to determine whether to execute a certain piece of code. The following is the syntax format of the if statement:

   if (条件) {
    // 如果条件为真，执行这里的代码
   }

   For example, we can use the if statement to determine whether a number is greater than 10 and output different results:

   int num = 15;
   
   if (num > 10) {
    System.out.println("数字大于10");
   } else {
    System.out.println("数字小于等于10");
   }

   In the above code, if If the value of the variable num is greater than 10, then "the number is greater than 10" is output, otherwise "the number is less than or equal to 10" is output.

2. switch statement
   The switch statement is also a conditional statement, which can execute different code blocks based on different conditions. The following is the syntax format of the switch statement:

   switch (表达式) {
    case 值1:
        // 执行代码块1
        break;
    case 值2:
        // 执行代码块2
        break;
    // 其他case语句...
    default:
        // 执行默认的代码块
        break;
   }

   For example, we can use the switch statement to output different information according to the day of the week:

   int day = 1;
   
   switch (day) {
    case 1:
        System.out.println("星期一");
        break;
    case 2:
        System.out.println("星期二");
        break;
    case 3:
        System.out.println("星期三");
        break;
    // 其他case语句...
    default:
        System.out.println("未知日期");
        break;
   }

   In the above code, depending on the value of the variable day, Output different information.

Summary:
Using conditional statements in Java can make logical judgments based on different conditions to determine the execution path of the program. The if statement and the switch statement are two commonly used conditional statement forms, which can be chosen according to the actual situation when writing code. When writing conditional statements, you need to pay attention to the expression of the condition and the code blocks of different branches to ensure the correctness of the program.

The above is an introduction to how to use conditional statements in Java to make logical judgments. I hope it can help readers.

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