Break all loops in java

Break all loops in java

• Introduction to Java
• The complete History of Java Programming Language
• C++ vs Java vs Python
• How to Download and Install Java for 64 bit machine?
• Setting up the environment in Java
• How to Download and Install Eclipse on Windows?
• JDK in Java
• How JVM Works – JVM Architecture?
• Differences between JDK, JRE and JVM
• Just In Time Compiler
• Difference between JIT and JVM in Java
• Difference between Byte Code and Machine Code
• How is Java platform independent?

• Decision Making in Java (if, if-else, switch, break, continue, jump)
• Java if statement with Examples
• Java if-else
• Java if-else-if ladder with Examples
• Loops in Java
• For Loop in Java
• Java while loop with Examples
• Java do-while loop with Examples
• For-each loop in Java
• Continue Statement in Java
• Break statement in Java
• Usage of Break keyword in Java
• return keyword in Java

• Object Oriented Programming (OOPs) Concept in Java
• Why Java is not a purely Object-Oriented Language?
• Classes and Objects in Java
• Naming Conventions in Java
• Java Methods
• Access Modifiers in Java
• Java Constructors
• Four Main Object Oriented Programming Concepts of Java
• Inheritance in Java
• Abstraction in Java
• Encapsulation in Java
• Polymorphism in Java
• Interfaces in Java
• ‘this’ reference in Java

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Break all loops in java

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Branching Statements

The break statement has two forms: labeled and unlabeled. You saw the unlabeled form in the previous discussion of the switch statement. You can also use an unlabeled break to terminate a for , while , or do-while loop, as shown in the following BreakDemo program:

class BreakDemo < public static void main(String[] args) < int[] arrayOfInts = < 32, 87, 3, 589, 12, 1076, 2000, 8, 622, 127 >; int searchfor = 12; int i; boolean foundIt = false; for (i = 0; i < arrayOfInts.length; i++) < if (arrayOfInts[i] == searchfor) < foundIt = true; break; > > if (foundIt) < System.out.println("Found " + searchfor + " at index " + i); >else < System.out.println(searchfor + " not in the array"); >> >

This program searches for the number 12 in an array. The break statement, shown in boldface, terminates the for loop when that value is found. Control flow then transfers to the statement after the for loop. This program’s output is:

An unlabeled break statement terminates the innermost switch , for , while , or do-while statement, but a labeled break terminates an outer statement. The following program, BreakWithLabelDemo , is similar to the previous program, but uses nested for loops to search for a value in a two-dimensional array. When the value is found, a labeled break terminates the outer for loop (labeled «search»):

class BreakWithLabelDemo < public static void main(String[] args) < int[][] arrayOfInts = < < 32, 87, 3, 589 >, < 12, 1076, 2000, 8 >, < 622, 127, 77, 955 >>; int searchfor = 12; int i; int j = 0; boolean foundIt = false; search: for (i = 0; i < arrayOfInts.length; i++) < for (j = 0; j < arrayOfInts[i].length; j++) < if (arrayOfInts[i][j] == searchfor) < foundIt = true; break search; >> > if (foundIt) < System.out.println("Found " + searchfor + " at " + i + ", " + j); >else < System.out.println(searchfor + " not in the array"); >> >

This is the output of the program.

The break statement terminates the labeled statement; it does not transfer the flow of control to the label. Control flow is transferred to the statement immediately following the labeled (terminated) statement.

The continue Statement

The continue statement skips the current iteration of a for , while , or do-while loop. The unlabeled form skips to the end of the innermost loop’s body and evaluates the boolean expression that controls the loop. The following program, ContinueDemo , steps through a String , counting the occurrences of the letter «p». If the current character is not a p, the continue statement skips the rest of the loop and proceeds to the next character. If it is a «p», the program increments the letter count.

class ContinueDemo < public static void main(String[] args) < String searchMe = "peter piper picked a " + "peck of pickled peppers"; int max = searchMe.length(); int numPs = 0; for (int i = 0; i < max; i++) < // interested only in p's if (searchMe.charAt(i) != 'p') continue; // process p's numPs++; >System.out.println("Found " + numPs + " p's in the string."); > >

Here is the output of this program:

To see this effect more clearly, try removing the continue statement and recompiling. When you run the program again, the count will be wrong, saying that it found 35 p’s instead of 9.

A labeled continue statement skips the current iteration of an outer loop marked with the given label. The following example program, ContinueWithLabelDemo , uses nested loops to search for a substring within another string. Two nested loops are required: one to iterate over the substring and one to iterate over the string being searched. The following program, ContinueWithLabelDemo , uses the labeled form of continue to skip an iteration in the outer loop.

class ContinueWithLabelDemo < public static void main(String[] args) < String searchMe = "Look for a substring in me"; String substring = "sub"; boolean foundIt = false; int max = searchMe.length() - substring.length(); test: for (int i = 0; i > foundIt = true; break test; > System.out.println(foundIt ? "Found it" : "Didn't find it"); > >

Here is the output from this program.

The return Statement

The last of the branching statements is the return statement. The return statement exits from the current method, and control flow returns to where the method was invoked. The return statement has two forms: one that returns a value, and one that doesn’t. To return a value, simply put the value (or an expression that calculates the value) after the return keyword.

The data type of the returned value must match the type of the method’s declared return value. When a method is declared void , use the form of return that doesn’t return a value.

The Classes and Objects lesson will cover everything you need to know about writing methods.

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Java break and Labeled break Statement

Once the execution of a loop statement in a program starts, it keeps repeating the execution of loop instructions as far as a given condition is true . Sometimes it may be required to break the execution flow in between. To break the execution flow of a loop, java provides a keyword called as break . It can be used inside for , while , do while and switch statements only. As soon as a break statement encountered in a loop, the execution of that loop get’s terminated and the control flow jumps to the next statements after the loop body. It is mostly used along with conditional statements( if , else ). The syntax of break statement is:

Control flow diagram of break statement

Once the break statement is executed, the remaining statements which are after the break and within the loop are skipped. Java break statement has two forms, labeled and unlabeled. Following program shows unlabeled break statement.

break Statement program in Java

 class BreakStatement < public static void main(String [] args) < for(int i=1; iif(i==4) < break; > System.out.println("i string">"line after for loop"); > >

i = 1
i = 2
i = 3
line after for loop

In above example, as soon as the value of i becomes 4 , the break statement is executed and the control flow jumps to next line( System.out.println(«line after for loop»); ) after the for loop, that is why value 4 and 5 is not printed.

What if I use break statement outside of loop or switch statement ?

Your program won’t compile, it will throw compilation error.

Does break Break Out all loops ?

No, It breaks only the current loop in which it is used.

If break statement is used inside any inner loop, it breaks only inner loop once it is executed and the execution flow moves to the next line after inner loop. The outer loop will be executed as usual.

 class InnerLoopBreakStatement < public static void main(String [] args) < for(int i=1; i"Outer loop i keyword">for(int j=1; jif(j==3) < break; > System.out.println("j string">"line after outer for loop"); > >

Outer loop i = 1
j = 1
j = 2
Outer loop i = 2
j = 1
j = 2
Outer loop i = 3
j = 1
j = 2
line after outer for loop

Labeled break Statement

A label is an identifier, from java SE 5 and above we can declare a set of statements with a label identifier. Labeled break statement allows programmer to break the execution of label statements.

 class LabeledBreakStatement < public static void main(String [] args) < firstLable: for(int i=1;i<=3;i++) < System.out.println("Outer loop i keyword">for(int j=1;j<=5;j++) < if(i==2 && j==2) < break firstLable; > System.out.println(" j string">"line after labeled break statement"); > >

Outer loop i = 1
j = 1
j = 2
j = 3
j = 4
j = 5
Outer loop i = 2
j = 1
line after labeled break statement

In above example as soon as the value of i and j becomes 2 the statement break firstLable is executed which breaks the firstLable statements and the execution moves to the next line which is System.out.println(«line after labeled break statement»);

See java switch statement tutorial for how break statement is used with switch statement in java.

• break statement cannot be used outside of a loop or a switch statement. If used, it will throw a compile time error.
• Ensure every letter of break keyword is small, can not use Break, BREAK, breaK etc.
• You can also place curly braces <> after label identifier to declare statements inside it.

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