Java flow control statements: 1. if statement; 2. if-else statement; 3. switch statement; 4. while loop; 5. do-while loop; 6. for loop; 7. foreach loop; 8. break statement; 9. continue statement; 10. return statement. Detailed introduction: 1. if statement, used to execute a code block based on a certain condition; 2. if-else statement, used to execute a code block based on a condition, otherwise execute another code block, etc.
The operating system for this tutorial: Windows 10 system, DELL G3 computer.
The flow control statements in the Java language mainly include the following types:
1. If statement: is used to execute a code block based on a certain condition.
if (condition) {
// code to be executed if the condition is true
}2. if-else statement: is used to execute a code block based on conditions, otherwise execute another code block.
if (condition) {
// code to be executed if the condition is true
} else {
// code to be executed if the condition is false
}3. Switch statement: is used to execute different code blocks based on different conditions. It is usually used when dealing with multiple selections.
switch (variable) {
case value1:
// code to be executed if variable equals value1
break;
case value2:
// code to be executed if variable equals value2
break;
default:
// code to be executed if variable doesn't match any values
}4. While loop: is used to repeatedly execute a piece of code until the given condition is no longer met.
while (condition) {
// code to be executed repeatedly until the condition becomes false
}5. do-while loop: First execute a piece of code, and then check the conditions. If the condition is true, the execution is repeated. This loop will be executed at least once.
do {
// code to be executed repeatedly until the condition becomes false
} while (condition);6. for loop: is used to repeatedly execute a piece of code a specified number of times. It consists of three parts: initialization, conditions and follow-up.
for (initialization; condition; update) {
// code to be executed repeatedly until the condition becomes false
}7. foreach loop: Used to traverse each element in an array or collection.
for (element : collection) {
// code to be executed for each element in the collection
}8. Break statement: Used to exit the loop or switch statement early. When a break statement is encountered, the program will immediately jump out of the current loop or switch statement.
9. Continue statement: is used to skip the remaining part of the current loop and enter the next loop. When a continue statement is encountered, the program will skip the remaining part of this loop and start the next loop directly.
10. Return statement: is used to return early from the method and can return a value. When the method executes to the return statement, it immediately ends the execution of the method and returns to the code that called the method. If the method has a return type, the return statement must return a value that is compatible with the return type.
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