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                [toc] # 三元操作符 表達式?值1:值2 如果表達式為真 返回值1 如果表達式為假 返回值2 注意:<b>值1和值2類型要一致</b> ~~~ public class HelloWorld { public static void main(String[] args) { int i = 5; int j = 6; int k = i < j ? 99 : 88; // 相當于 if (i < j) { k = 99; } else { k = 88; } System.out.println(k); } } ~~~ # Scanner ## 使用Scanner讀取整數 ~~~ import java.util.Scanner; public class HelloWorld { public static void main(String[] args) { Scanner s = new Scanner(System.in); int a = s.nextInt(); System.out.println("第一個整數:"+a); int b = s.nextInt(); System.out.println("第二個整數:"+b); } } ~~~ ## 使用Scanner讀取浮點數 ~~~ import java.util.Scanner; public class HelloWorld { public static void main(String[] args) { Scanner s = new Scanner(System.in); float a = s.nextFloat(); System.out.println("讀取的浮點數的值是:"+a); } } ~~~ ## 使用Scanner讀取字符串 ~~~ import java.util.Scanner; public class HelloWorld { public static void main(String[] args) { Scanner s = new Scanner(System.in); String a = s.nextLine(); System.out.println("讀取的字符串是:"+a); } } ~~~
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