{"id":229,"date":"2010-06-10T06:24:00","date_gmt":"1970-01-01T00:00:00","guid":{"rendered":"http:\/\/www.yazilimmutfagi.com\/?p=229"},"modified":"2010-06-10T06:24:00","modified_gmt":"1970-01-01T00:00:00","slug":"java-switch-case-kullanimi","status":"publish","type":"post","link":"https:\/\/www.yazilimmutfagi.com\/index.php\/2010\/06\/10\/java-switch-case-kullanimi\/","title":{"rendered":"Java – Switch case kullanimi"},"content":{"rendered":"

 Swicth case yapisinin varligi bize bir çok if – else yazmaktan kurtararak yazdigimiz kodlarin daha kolayu anlasilir ve takip edilebilir olmasini saglar.  Yapi olarak C dilinden günümüze degisim göstermemistir diyebiliriz. Bu makalemizde nasit örneklerle switch case yapisini anlamaya çalisacagiz.<\/p>\n


\n<\/b><\/span><\/font><\/div>\n
\n
 <\/b><\/div>\n
public <\/span><\/b>class<\/span><\/b> Switch {<\/span><\/div>\n
      <\/span>public <\/span><\/b>static <\/span><\/b>void<\/span><\/b> main(String[] args){<\/span><\/div>\n
            <\/span>int<\/span><\/b> yas=2;<\/span><\/div>\n
            <\/span><\/div>\n
            <\/span>switch<\/span><\/b>(yas){<\/span><\/div>\n
            <\/span>case<\/span><\/b> 1:<\/span><\/div>\n
                  System.<\/span>out<\/span><\/i>.println(<\/span>"Bir yasindasin"<\/span>);<\/span><\/div>\n
                  <\/span>break<\/span><\/b>;<\/span><\/div>\n
            <\/span>case<\/span><\/b> 2:<\/span><\/div>\n
                  System.<\/span>out<\/span><\/i>.println(<\/span>"iki yasindasin"<\/span>);<\/span><\/div>\n
                  <\/span>break<\/span><\/b>;<\/span><\/div>\n
            <\/span>case<\/span><\/b> 3:<\/span><\/div>\n
                  System.<\/span>out<\/span><\/i>.println(<\/span>"üç yasindasin"<\/span>);<\/span><\/div>\n
                  <\/span>break<\/span><\/b>;<\/span><\/div>\n
            <\/span>default<\/span><\/b>:<\/span><\/div>\n
                  System.<\/span>out<\/span><\/i>.println(<\/span>"kaç yasindasin?"<\/span>);                     <\/span><\/div>\n
            <\/span>}<\/span><\/div>\n
      }<\/span><\/div>\n
}<\/span><\/div>\n<\/div>\n
 <\/div>\n
Program çiktisi:<\/span><\/div>\n
iki yasindasin<\/span><\/div>\n
 <\/div>\n
Simdi break olmadan kullanalim.
\n
\n<\/span><\/div>\n
 <\/div>\n
\n
            <\/span>int<\/span><\/b> gunler=1;<\/span><\/div>\n
            <\/span><\/div>\n
            <\/span>switch<\/span><\/b>(gunler){<\/span><\/div>\n
            <\/span>case<\/span><\/b> 1:<\/span><\/div>\n
                  System.<\/span>out<\/span><\/i>.println(<\/span>"Pazartesi"<\/span>);               <\/span><\/div>\n
            <\/span>case<\/span><\/b> 2:<\/span><\/div>\n
                  System.<\/span>out<\/span><\/i>.println(<\/span>"Sali"<\/span>);<\/span><\/div>\n
            <\/span>case<\/span><\/b> 3:<\/span><\/div>\n
                  System.<\/span>out<\/span><\/i>.println(<\/span>"çarsamba"<\/span>);<\/span><\/div>\n
            <\/span>case<\/span><\/b> 4:<\/span><\/div>\n
                  System.<\/span>out<\/span><\/i>.println(<\/span>"Persembe"<\/span>);<\/span><\/div>\n
            <\/span>case<\/span><\/b> 5:<\/span><\/div>\n
                  System.<\/span>out<\/span><\/i>.println(<\/span>"Cuma"<\/span>);<\/span><\/div>\n
            <\/span>case<\/span><\/b> 6:<\/span><\/div>\n
                  System.<\/span>out<\/span><\/i>.println(<\/span>"Cumartesi"<\/span>);<\/span><\/div>\n
            <\/span>case<\/span><\/b> 7:                 <\/span><\/div>\n
                  <\/span>System.<\/span>out<\/span><\/i>.println(<\/span>"Pazar"<\/span>);<\/span><\/div>\n
            }<\/span><\/div>\n<\/div>\n
 <\/div>\n
Program çiktisi:
\n.<\/a><\/span><\/span><\/div>\n
 <\/div>\n
Pazartesi<\/span><\/div>\n
Sali<\/span><\/div>\n
çarsamba<\/span><\/div>\n
Persembe<\/span><\/div>\n
Cuma<\/span><\/div>\n
Cumartesi<\/span><\/div>\n
Pazar<\/span><\/div>\n
 <\/div>\n
Hiç bir yerde kesinti (break) olmadigi için 1’den 7’ye kadar olan bütün ihtimalleri ele aldi.<\/span><\/div>\n
Örnegin 3’ten sonra bereak deseydik yalniz ilk üç günü yazacakti:<\/span><\/div>\n
 <\/div>\n
Pazartesi<\/span><\/div>\n
Sali<\/span><\/div>\n
çarsamba<\/span><\/div>\n
 <\/div>\n
gibi.<\/span><\/div>\n
 <\/div>\n
 <\/div>\n
Default<\/span><\/b><\/div>\n
 <\/div>\n
Eger 7’den daha büyük, mesela 10 gibi bir sayi girseydik ne olacakti? Case listesinde 10 olmadigi için çikti olarak bos hiç bir sey göremeyecektik.<\/span><\/div>\n
Eger illa bir sonuç görmek istiyorsak o zaman default’u kullanmaliyiz.<\/span><\/div>\n
 <\/div>\n
\n
            <\/span>int<\/span><\/b> gunler=8;<\/span><\/div>\n
            <\/span><\/div>\n
            <\/span>switch<\/span><\/b>(gunler){<\/span><\/div>\n
            <\/span>case<\/span><\/b> 1:<\/span><\/div>\n
                  System.<\/span>out<\/span><\/i>.println(<\/span>"Pazartesi"<\/span>);               <\/span><\/div>\n
            <\/span>case<\/span><\/b> 2:<\/span><\/div>\n
                  System.<\/span>out<\/span><\/i>.println(<\/span>"Sali"<\/span>);<\/span><\/div>\n
            <\/span>case<\/span><\/b> 3:<\/span><\/div>\n
                  System.<\/span>out<\/span><\/i>.println(<\/span>"çarsamba"<\/span>);<\/span><\/div>\n
            <\/span>case<\/span><\/b> 4:<\/span><\/div>\n
                  System.<\/span>out<\/span><\/i>.println(<\/span>"Persembe"<\/span>);<\/span><\/div>\n
            <\/span>case<\/span><\/b> 5:<\/span><\/div>\n
                  System.<\/span>out<\/span><\/i>.println(<\/span>"Cuma"<\/span>);<\/span><\/div>\n
            <\/span>case<\/span><\/b> 6:<\/span><\/div>\n
                  System.<\/span>out<\/span><\/i>.println(<\/span>"Cumartesi"<\/span>);<\/span><\/div>\n
            <\/span>case<\/span><\/b> 7:                 <\/span><\/div>\n
                  System.<\/span>out<\/span><\/i>.println(<\/span>"Pazar"<\/span>);<\/span><\/div>\n
                  <\/span>default<\/span><\/b>:<\/span><\/div>\n
                  System.<\/span>out<\/span><\/i>.println(<\/span>"Geçersiz gün numarasi!"<\/span>);<\/span><\/div>\n
            <\/span>}<\/span><\/div>\n<\/div>\n
 <\/div>\n
Program çiktisi:<\/span><\/div>\n
Geçersiz gün numarasi!<\/span><\/div>\n
 <\/div>\n
Bir de söyle degisik bir örnek yapalim. Eger Gün numarasi 1’den 5’e kadar herhangi bir sayi ise “Hafta içi”, 6 veya 7 ise “Hafta sonu”, hiç biri degilse “Geçersiz gün numarasi” çiktisini alalim:<\/span><\/div>\n
 <\/div>\n
\n
            <\/span>int<\/span><\/b> gunler=5;<\/span><\/div>\n
            <\/span><\/div>\n
            <\/span>switch<\/span><\/b>(gunler){<\/span><\/div>\n
            <\/span>case<\/span><\/b> 1:     <\/span><\/div>\n
            <\/span>case<\/span><\/b> 2:<\/span><\/div>\n
            <\/span>case<\/span><\/b> 3:<\/span><\/div>\n
            <\/span>case<\/span><\/b> 4:<\/span><\/div>\n
            <\/span>case<\/span><\/b> 5:<\/span><\/div>\n
                  System.<\/span>out<\/span><\/i>.println(<\/span>"Hafta içi"<\/span>);<\/span><\/div>\n
                  <\/span>break<\/span><\/b>;<\/span><\/div>\n
            <\/span>case<\/span><\/b> 6:<\/span><\/div>\n
            <\/span>case<\/span><\/b> 7:                 <\/span><\/div>\n
                  System.<\/span>out<\/span><\/i>.println(<\/span>"Hafta sonu"<\/span>);<\/span><\/div>\n
                  <\/span>default<\/span><\/b>:<\/span><\/div>\n
                  System.<\/span>out<\/span><\/i>.println(<\/span>"Geçersiz gün numarasi!"<\/span>);<\/span><\/div>\n
            <\/span>}<\/span><\/div>\n<\/div>\n
 <\/div>\n
Program çiktisi:<\/span><\/div>\n
Hafta içi
\n.<\/a><\/span><\/span><\/div>","protected":false},"excerpt":{"rendered":"

Bir kiyaslama ve karar verme mekanizmasi olan switch case yapisinin java programlama dilinde nasil kullanildigini ögrenecegiz. <\/p>\n","protected":false},"author":519,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[419],"tags":[4196,4933,4584,5319],"_links":{"self":[{"href":"https:\/\/www.yazilimmutfagi.com\/index.php\/wp-json\/wp\/v2\/posts\/229"}],"collection":[{"href":"https:\/\/www.yazilimmutfagi.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.yazilimmutfagi.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.yazilimmutfagi.com\/index.php\/wp-json\/wp\/v2\/users\/519"}],"replies":[{"embeddable":true,"href":"https:\/\/www.yazilimmutfagi.com\/index.php\/wp-json\/wp\/v2\/comments?post=229"}],"version-history":[{"count":0,"href":"https:\/\/www.yazilimmutfagi.com\/index.php\/wp-json\/wp\/v2\/posts\/229\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.yazilimmutfagi.com\/index.php\/wp-json\/wp\/v2\/media?parent=229"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.yazilimmutfagi.com\/index.php\/wp-json\/wp\/v2\/categories?post=229"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.yazilimmutfagi.com\/index.php\/wp-json\/wp\/v2\/tags?post=229"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}