In this tutorial, we will learn about the try catch statement in Java with the help of examples.<\/p>\n\n\n\n
The Here’s the syntax of a The The Output<\/strong><\/p>\n\n\n\n In the above example, notice the line,<\/p>\n\n\n\n Here, we are trying to divide a number by zero<\/strong>. In this case, an exception occurs. Hence, we have enclosed this code inside the When the program encounters this code, The Note<\/strong>: In Java, we can use a We can also use the In this case, the finally block is always executed whether there is an exception inside the try block or not.<\/p>\n\n\n\n Output<\/strong><\/p>\n\n\n\n In the above example, we have used the However, the code inside the In Java, we can also use the finally block after the Output<\/strong><\/p>\n\n\n\n In the above example, we have created an array named list<\/var> and a file named output.txt<\/var>. Here, we are trying to read data from the array and storing to the file.<\/p>\n\n\n\n Notice the code,<\/p>\n\n\n\n Here, the size of the array is Hence, the code generates an exception that is caught by the catch block.<\/p>\n\n\n\n Since the It is a good practice to use finally block to include important cleanup code like closing a file or connection.<\/p>\n\n\n\n Note<\/strong>: There are some cases when a For each The argument type of each Output<\/strong><\/p>\n\n\n\n In this example, we have created an integer array named Since the array index starts from 0<\/strong>, the last element of the array is at Here, we are trying to assign a value to the index 10<\/strong>. Hence, When an exception occurs in the From Java SE 7 and later, we can now catch more than one type of exception with one This reduces code duplication and increases code simplicity and efficiency.<\/p>\n\n\n\n Each exception type that can be handled by the Its syntax is:<\/p>\n\n\n\n <\/p>\n\n\n\n The try-with-resources<\/strong> statement is a try statement that has one or more resource declarations.<\/p>\n\n\n\n Its syntax is:<\/p>\n\n\n\n The resource is an object to be closed at the end of the program. It must be declared and initialized in the try statement.<\/p>\n\n\n\n Let’s take an example.<\/p>\n\n\n\n The try-with-resources<\/strong> statement is also referred to as automatic resource management<\/strong>. This statement automatically closes all the resources at the end of the statement.<\/p>\n","protected":false},"excerpt":{"rendered":" In this tutorial, we will learn about the try catch statement in Java with the help of examples. The try…catch block in Java is used to handle exceptions and prevents the abnormal termination of the program. Here’s the syntax of a try…catch block in Java. The try block includes the code that might generate an exception. The catch block includes the code that […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[569],"tags":[],"_links":{"self":[{"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/posts\/1245"}],"collection":[{"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/comments?post=1245"}],"version-history":[{"count":0,"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/posts\/1245\/revisions"}],"wp:attachment":[{"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/media?parent=1245"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/categories?post=1245"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/tags?post=1245"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}try...catch<\/code> block in Java is used to handle exceptions and prevents the abnormal termination of the program.<\/p>\n\n\n\ntry...catch<\/code> block in Java.<\/p>\n\n\n\ntry{\n \/\/ code\n}\ncatch(exception) {\n \/\/ code\n}<\/code><\/pre>\n\n\n\ntry<\/code> block includes the code that might generate an exception.<\/p>\n\n\n\ncatch<\/code> block includes the code that is executed when there occurs an exception inside the try<\/code> block.<\/p>\n\n\n\nExample: Java try…catch block<\/h3>\n\n\n\n
class Main {\n public static void main(String[] args) {\n\n try {\n int divideByZero = 5 \/ 0;\n System.out.println(\"Rest of code in try block\");\n }\n\n catch (ArithmeticException e) {\n System.out.println(\"ArithmeticException => \" + e.getMessage());\n }\n }\n}<\/code><\/pre>\n\n\n\nArithmeticException => \/ by zero<\/samp><\/code><\/pre>\n\n\n\nint divideByZero = 5 \/ 0;<\/code><\/pre>\n\n\n\ntry<\/code> block.<\/p>\n\n\n\nArithmeticException<\/code> occurs. And, the exception is caught by the catch<\/code> block and executes the code inside the catch<\/code> block.<\/p>\n\n\n\ncatch<\/code> block is only executed if there exists an exception inside the try<\/code> block.<\/p>\n\n\n\ntry<\/code> block without a catch<\/code> block. However, we cannot use a catch<\/code> block without a try<\/code> block.<\/p>\n\n\n\n
\n\n\n\nJava try…finally block<\/h2>\n\n\n\n
try<\/code> block along with a finally block.<\/p>\n\n\n\nExample: Java try…finally block<\/h3>\n\n\n\n
class Main {\n public static void main(String[] args) {\n try {\n int divideByZero = 5 \/ 0;\n }\n\n finally {\n System.out.println(\"Finally block is always executed\");\n }\n }\n}<\/code><\/pre>\n\n\n\nFinally block is always executed\nException in thread \"main\" java.lang.ArithmeticException: \/ by zero\n at Main.main(Main.java:4)<\/samp><\/code><\/pre>\n\n\n\ntry<\/code> block along with the finally<\/code> block. We can see that the code inside the try<\/code> block is causing an exception.<\/p>\n\n\n\nfinally<\/code> block is executed irrespective of the exception.<\/p>\n\n\n\n
\n\n\n\nJava try…catch…finally block<\/h2>\n\n\n\n
try...catch<\/code> block. For example,<\/p>\n\n\n\nimport java.io.*;\n\nclass ListOfNumbers {\n\n \/\/ create an integer array\n private int[] list = {5, 6, 8, 9, 2};\n\n \/\/ method to write data from array to a fila\n public void writeList() {\n PrintWriter out = null;\n\n try {\n System.out.println(\"Entering try statement\");\n\n \/\/ creating a new file OutputFile.txt\n out = new PrintWriter(new FileWriter(\"OutputFile.txt\"));\n\n \/\/ writing values from list array to Output.txt\n for (int i = 0; i < 7; i++) {\n out.println(\"Value at: \" + i + \" = \" + list[i]);\n }\n }\n \n catch (Exception e) {\n System.out.println(\"Exception => \" + e.getMessage());\n }\n \n finally {\n \/\/ checking if PrintWriter has been opened\n if (out != null) {\n System.out.println(\"Closing PrintWriter\");\n \/\/ close PrintWriter\n out.close();\n }\n \n else {\n System.out.println(\"PrintWriter not open\");\n }\n }\n\n }\n}\n\nclass Main {\n public static void main(String[] args) {\n ListOfNumbers list = new ListOfNumbers();\n list.writeList();\n }\n}<\/code><\/pre>\n\n\n\nEntering try statement\nException => Index 5 out of bounds for length 5\nClosing PrintWriter<\/samp><\/code><\/pre>\n\n\n\nfor (int i = 0; i < 7; i++) {\n out.println(\"Value at: \" + i + \" = \" + list[i]);\n}<\/code><\/pre>\n\n\n\n5<\/code> and the last element of the array is at list[4]<\/code>. However, we are trying to access elements at a[5]<\/em><\/code> and a[6]<\/code>.<\/p>\n\n\n\nfinally<\/code> block is always executed, we have included code to close the PrintWriter<\/code> inside the finally block.<\/p>\n\n\n\nfinally<\/code> block does not execute:<\/p>\n\n\n\nSystem.exit()<\/code> method<\/li>finally<\/code> block<\/li>
\n\n\n\nMultiple Catch blocks<\/h2>\n\n\n\n
try<\/code> block, there can be zero or more catch<\/code> blocks. Multiple catch<\/code> blocks allow us to handle each exception differently.<\/p>\n\n\n\ncatch<\/code> block indicates the type of exception that can be handled by it. For example,<\/p>\n\n\n\nclass ListOfNumbers {\n public int[] arr = new int[10];\n\n public void writeList() {\n\n try {\n arr[10] = 11;\n }\n \n catch (NumberFormatException e1) {\n System.out.println(\"NumberFormatException => \" + e1.getMessage());\n }\n \n catch (IndexOutOfBoundsException e2) {\n System.out.println(\"IndexOutOfBoundsException => \" + e2.getMessage());\n }\n\n }\n}\n\nclass Main {\n public static void main(String[] args) {\n ListOfNumbers list = new ListOfNumbers();\n list.writeList();\n }\n}<\/code><\/pre>\n\n\n\nIndexOutOfBoundsException => Index 10 out of bounds for length 10<\/samp><\/code><\/pre>\n\n\n\narr<\/code> of size 10<\/strong>.<\/p>\n\n\n\narr[9]<\/code>. Notice the statement,<\/p>\n\n\n\narr[10] = 11;<\/code><\/pre>\n\n\n\nIndexOutOfBoundException<\/code> occurs.<\/p>\n\n\n\ntry<\/code> block,<\/p>\n\n\n\ncatch<\/code> block. The first catch<\/code> block does not handle an IndexOutOfBoundsException<\/code>, so it is passed to the next catch<\/code> block.<\/li>catch<\/code> block in the above example is the appropriate exception handler because it handles an IndexOutOfBoundsException<\/code>. Hence, it is executed.<\/li><\/ul>\n\n\n\n
\n\n\n\nCatching Multiple Exceptions<\/h3>\n\n\n\n
catch<\/code> block.<\/p>\n\n\n\ncatch<\/code> block is separated using a vertical bar |<\/code>.<\/p>\n\n\n\ntry {\n \/\/ code\n} catch (ExceptionType1 | Exceptiontype2 ex) { \n \/\/ catch block\n}<\/code><\/pre>\n\n\n\n
\n\n\n\nJava try-with-resources statement<\/h3>\n\n\n\n
try (resource declaration) {\n \/\/ use of the resource\n} catch (ExceptionType e1) {\n \/\/ catch block\n}<\/code><\/pre>\n\n\n\ntry (PrintWriter out = new PrintWriter(new FileWriter(\"OutputFile.txt\")) {\n \/\/ use of the resource\n}<\/code><\/pre>\n\n\n\n