Detailed explanation of break statement of Java (25) from zero

Example 1

for loop without break.

public class Test2 { public static void main(String[] args) { //for loop printing for (int i = 0; i < 10; i++) { System.out.println("Print:"+i); } } }

Operation results:

Print: 0
Print: 1
Print: 2
Print: 3
Print: 4
Print: 5
Print: 6
Printing: 7
Printing: 8
Print: 9

If I want to stop printing after 5, I need to use the break statement at this time.

Example 2

Use the break statement in the for loop (print to 5 and exit)

public class Test2 { public static void main(String[] args) { //for loop printing for (int i = 0; i < 10; i++) { System.out.println("Print:"+i); if(i==5){ break; } } } }

Print: 0
Print: 1
Print: 2
Print: 3
Print: 4
Print: 5

♀ Little AD: I'm not happy with this game. Just quit?
♂ Ming Shiyin: Yes, it's a similar effect.
♀ Little AD: so I understand. It means that the later ones are filtered out without need, saving time.
♂ Ming Shiyin: it saves performance.

Example 3

If break is used in a nested for loop, it will only jump out of the current loop.

public class Test2 { public static void main(String[] args) { // External circulation, 5 times for (int i = 0; i < 5; i++) { System.out.print("The first" + (i + 1) + "Second cycle:"); // Internal circulation, designed as 10 cycles for (int j = 0; j < 10; j++) { // Judge whether j is equal to 3. If so, terminate the cycle if (j == 3) { break; } System.out.print("Second stage of internal circulation" + (j + 1) + "Secondary cycle\t"); } System.out.println(); } } }

Operation results:

1st cycle: 1st cycle of internal cycle 2nd cycle of internal cycle 3rd cycle of internal cycle
2nd cycle: 1st cycle of internal cycle 2nd cycle of internal cycle 3rd cycle of internal cycle
The third cycle: the first cycle of the internal cycle, the second cycle of the internal cycle, and the third cycle of the internal cycle
Cycle 4: the first cycle of the internal cycle, the second cycle of the internal cycle, and the third cycle of the internal cycle
Cycle 5: the first cycle of the internal cycle, the second cycle of the internal cycle, and the third cycle of the internal cycle

♂ Ming Shiyin: it can be seen that after the condition j==3 is met in the inner loop, the loop is exited.
♀ Little AD: but the external circulation is still 5 times.
♂ Ming Shiyin: because break will only jump out of the current cycle.
♀ Little AD: then I want to jump out of the loop.
♂ Ming Shiyin: there are also ways.

Example 4

Use break label syntax to implement goto like functions

public class Test3 { public static void main(String[] args) { // External circulation out:for (int i = 0; i < 5; i++) { System.out.print("The first" + (i + 1) + "Second cycle:"); // Internal circulation, designed as 10 cycles for (int j = 0; j < 10; j++) { // Judge whether j is equal to 3. If so, terminate the cycle if (j == 3) { break out; } System.out.print("Second stage of internal circulation" + (j + 1) + "Secondary cycle\t"); } System.out.println(); } } }

Operation results:

1st cycle: 1st cycle of internal cycle 2nd cycle of internal cycle 3rd cycle of internal cycle

Analysis: we use out to name the entire code block of the outer layer. When j==3 is true, breaking out directly is equivalent to directly ending the entire loop code.

♀ Little AD: so break has so many uses, seconds.
♂ Ming Shiyin: so we should learn knowledge often. The more we know, the more we feel we need to learn. The more we learn, the more energetic we are.
♀ Little AD: it seems that there is such a thing. I don't really want to learn today, but it doesn't taste.
♂ Ming Shiyin: Hey, I'm addicted.
♀ Little AD: it's like playing a game. When you lose, you still have to continue to play.
♂ Mingshiyin: learning Java with this momentum can certainly become a great God.
♀ Little AD: I'm super God.

This section summarizes the "detailed explanation of break statements". I hope it can be helpful to you. Please help [like] + [collection] + [punch in the comment area]. If you are interested in learning Java with brother Xiao Ming, [pay attention to a wave] won't get lost.

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