Scanner ???? ??? ? ????. ?? ??? ?? ??? ???? Scanner? ???? ???? ???????.
package first;
import java.util.Scanner;
public class Input {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);//定義scanner，等待輸入
System.out.println("請(qǐng)輸入你的姓名:");
String name = in.nextLine();//字符類型的輸入方式
System.out.println(name);
System.out.println("請(qǐng)輸入你的年齡：");
int age = in.nextInt();//整數(shù)類型的輸入方式
System.out.println(age);
System.out.println("請(qǐng)輸入你的身高：");
double height = in.nextDouble();//小數(shù)類型的輸入方式
System.out.println(height);
}
} Scanner ???? java.util.Scanner? ????. ?????? ???? ?? ???? ???. ? ???? ????. java.util.Scanner包中，因此在程序前面要加上此包。
其中Scanner in = new Scanner(System.in);這一句是關(guān)鍵。這一句的意思是：通過(guò)new Scanner(System.in)創(chuàng)建一個(gè)Scanner，控制臺(tái)會(huì)一直等待輸入，直到敲回車(chē)鍵結(jié)束，把所輸入的內(nèi)容傳給Scanner，作為掃描對(duì)象。
然后如果想要獲取輸入的內(nèi)容，就需要調(diào)用Scanner的nextLine()方法，因此就用到了String name = in.nextLine()，int age = in.nextInt()，double height = in.nextDouble()
Scanner in = new Scanner(System.in); ??? ?????. ? ??? ??? ??? ????. ? Scanner(System.in)? ?? Scanner? ?????. ??? Enter ?? ?? ??? ??? ????, ??? ???? Scanner? ??? ??? ?????. ?? ?? ?? ??? ???? Scanner? nextLine() ???? ???? ??? String name = in.nextLine(), int age = in.nextInt? ?????. (), double height = in.nextDouble()? ???? ?? ???? ?????. ??? ??? ??? Scanner ???? ??? ???? ????. ???, ?? ?? ?? ??? ???? ?? ??? ????? ? ?? ?? ??? ?? ???. ??? ? ?? ???? ? ?? nextLine() ???? ?? ??? ?? ??? ?? ??? ?? ??? ????. package first;
import java.util.Scanner;
public class Input {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);//定義scanner，等待輸入
System.out.println("請(qǐng)輸入你的姓名:");
String name = in.nextLine();//字符類型的輸入方式
System.out.println(name);
System.out.println("請(qǐng)輸入你的年齡：");
int age = in.nextInt();//整數(shù)類型的輸入方式
System.out.println(age);
System.out.println("請(qǐng)輸入蘋(píng)果的英文：");
//String s = in.next();
String s = in.nextLine();
System.out.println(s);
System.out.println("請(qǐng)輸入你的身高：");
double height = in.nextDouble();//小數(shù)類型的輸入方式
System.out.println(height);
}
} ?????? Apple ?? ??? ???? ?? ?? ????? ?? ? ? ????. ??? ?? ?? ?, ??? ??? ? ??? ??? nextLine()?? ??? ???? ???? ???? in.next()? ???? ??? ?????. 
in.nextLine()? ?? ??? ??? ????.
in.next()? ?? ??? ??? ????.
nextLine()? next()? ???:
nextLine( ) ???? Enter ? ??? ?? ??? ???? ??? ??? ???? ??? ? ????.
next()? ??? ?? ?? ??? ???? ???? ??? ??? ???? ?????.
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