Java是一種面向?qū)ο蟮木幊陶Z言。在編寫Java代碼時,語法是非常重要的,因為恰當?shù)恼Z法可以使你的代碼易于理解和維護。下面是幾種Java語法:
//基本數(shù)據(jù)類型 int myInt = 10; double myDouble = 3.14; boolean myBoolean = true; char myChar = 'a'; //數(shù)組 int[] myIntArray = {1, 2, 3, 4}; String[] myStringArray = {"Hello", "World"}; //條件語句 if(myInt >5){ System.out.println("myInt is greater than 5"); }else{ System.out.println("myInt is less than or equal to 5"); } //循環(huán)語句 for(int i=0;i在Java中,有很多常用類可以幫助你編寫高效的程序。下面是幾個基礎(chǔ)類:
//String類 String myString = "Hello World!"; System.out.println(myString.length()); //輸出: 12 System.out.println(myString.toUpperCase()); //輸出: HELLO WORLD! //Math類 double x = 3.14; System.out.println(Math.ceil(x)); //輸出: 4.0 System.out.println(Math.floor(x)); //輸出: 3.0 //Date類 Date now = new Date(); System.out.println(now.toString()); //輸出: Thu Aug 26 10:35:15 EDT 2021 //Random類 Random rand = new Random(); System.out.println(rand.nextInt(10)); //輸出: 隨機數(shù)在0~9之間在Java編程中,深入理解語法和掌握常用類是很重要的。只有掌握了這些基礎(chǔ),才能寫出高效的、易于維護的代碼。