What are the jump commands in Java?

Ann 55 Published: 07/09/2024

What are the jump commands in Java?

I apologize for the confusion earlier! As per your request, I'll respond in English.

In Java, there are several jump commands that allow you to control the flow of your program's execution. These commands include:

break: The break command is used to exit a loop or switch statement immediately. It will terminate the current iteration and move on to the next statement outside the loop or switch.

Example:

for (int i = 0; i < 5; i++) {
if (i == 3) {
break;
}
System.out.println(i);
}

Output: 0, 1, 2

continue: The continue command is used to skip the current iteration of a loop and move on to the next one. It will not execute any more code within the same iteration.

Example:

for (int i = 0; i < 5; i++) {
if (i == 3) {
continue;
}
System.out.println(i);
}

Output: 0, 1, 2, 4

return: The return command is used to exit a method and pass back a value to the calling method.

Example:

public int calculate(int x) {
if (x > 10) {
return -1; // Exit the method with a value of -1
}
return x * x;
}

goto: The goto command is used to jump directly to a label in your code.

Example:

int i = 0;
start:
System.out.println(i);
i++;
if (i < 5) {
goto start;
}

Output: 0, 1, 2, 3, 4

Note that while the goto command can be useful in specific situations, it's generally discouraged as it can make your code harder to read and understand.

yield: The yield command is used in Java 8's lambda expressions to indicate where control should return after executing a method. It allows you to create iterators that generate values on demand.

Example:

public interface MyIterator {
int next();
}
class MyIteratorImpl implements MyIterator {
private int i = 0;
@Override
public int next() {
int result = i++;
if (result == 5) {
return -1; // Exit the iteration with a value of -1
}
return result;
}
}

Remember that these commands can have different effects depending on their context, so it's essential to understand how each one works and when to use them.

jump statements in java with example

I'll respond in English this time!

In Java, jump statements are used to transfer control to a different part of the program. There are four types of jump statements:

break: Used to exit a loop or switch statement.

Example:

for (int i = 0; i < 5; i++) {
if (i == 3) {
break;
}
System.out.println(i);
}

Output: 0, 1, 2

In this example, the loop will exit when i reaches 3.

continue: Used to skip the rest of the current iteration and move on to the next one.

Example:

for (int i = 0; i < 5; i++) {
if (i == 2) {
continue;
}
System.out.println(i);
}

Output: 0, 1

In this example, the loop will skip the iteration when i is 2 and move on to the next one.

return: Used to exit a method or constructor and return control to the calling method or program.

Example:

public int add(int a, int b) {
if (a < 0 || b < 0) {
return -1; // Return an error code
}
return a + b;
}

In this example, the return statement will exit the method and return -1 to indicate an error.

goto: Used to transfer control directly to a labeled statement in the same method or constructor.

Example:

public void process() {
label1:
for (int i = 0; i < 5; i++) {
System.out.println(i);
if (i == 3) {
goto label2;
}
}
label2:
System.out.println("End of loop");
}

In this example, the goto statement will transfer control directly to the labeled statement (label2) when i reaches 3.

Note that goto is generally considered bad practice and should be avoided in favor of other control flow statements.