Skip to content

Commit 37ea587

Browse files
chao420456chao420456
committed
Java第十二天
1 parent ecaf465 commit 37ea587

63 files changed

Lines changed: 1069 additions & 0 deletions

File tree

Some content is hidden

Large Commits have some content hidden by default. Use the searchbox below for content that may be hidden.

‎day12/String创建对象和直接赋值的区别.bmp‎

2.24 MB
Binary file not shown.

‎day12/code/day12_Scanner/.classpath‎

Lines changed: 6 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,6 @@
1+
<?xml version="1.0" encoding="UTF-8"?>
2+
<classpath>
3+
<classpathentry kind="src" path="src"/>
4+
<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.7"/>
5+
<classpathentry kind="output" path="bin"/>
6+
</classpath>

‎day12/code/day12_Scanner/.project‎

Lines changed: 17 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,17 @@
1+
<?xml version="1.0" encoding="UTF-8"?>
2+
<projectDescription>
3+
<name>day12_Scanner</name>
4+
<comment></comment>
5+
<projects>
6+
</projects>
7+
<buildSpec>
8+
<buildCommand>
9+
<name>org.eclipse.jdt.core.javabuilder</name>
10+
<arguments>
11+
</arguments>
12+
</buildCommand>
13+
</buildSpec>
14+
<natures>
15+
<nature>org.eclipse.jdt.core.javanature</nature>
16+
</natures>
17+
</projectDescription>

‎day12/code/day12_Scanner/.settings/org.eclipse.jdt.core.prefs‎

Lines changed: 11 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,11 @@
1+
eclipse.preferences.version=1
2+
org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
3+
org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.7
4+
org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
5+
org.eclipse.jdt.core.compiler.compliance=1.7
6+
org.eclipse.jdt.core.compiler.debug.lineNumber=generate
7+
org.eclipse.jdt.core.compiler.debug.localVariable=generate
8+
org.eclipse.jdt.core.compiler.debug.sourceFile=generate
9+
org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
10+
org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
11+
org.eclipse.jdt.core.compiler.source=1.7

‎day12/code/day12_Scanner/bin/cn/itcast_01/ScannerDemo.class‎

575 Bytes
Binary file not shown.

‎day12/code/day12_Scanner/bin/cn/itcast_02/ScannerDemo.class‎

904 Bytes
Binary file not shown.

‎day12/code/day12_Scanner/bin/cn/itcast_03/ScannerDemo.class‎

783 Bytes
Binary file not shown.

‎day12/code/day12_Scanner/bin/cn/itcast_03/ScannerDemo2.class‎

882 Bytes
Binary file not shown.

‎day12/code/day12_Scanner/src/cn/itcast_01/ScannerDemo.java‎

Lines changed: 34 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,34 @@
1+
package cn.itcast_01;
2+
3+
import java.io.InputStream;
4+
import java.util.Scanner;
5+
6+
/*
7+
* Scanner:JDK5以后，用于帮助我们实现键盘录入数据的。
8+
*
9+
* 构造方法：
10+
* public Scanner(InputStream source)
11+
*/
12+
public class ScannerDemo {
13+
public static void main(String[] args) {
14+
// 创建键盘录入对象
15+
// Scanner sc = new Scanner(System.in);
16+
17+
// public Scanner(InputStream source)
18+
19+
// System类下有这样的一个成员变量
20+
// public static final InputStream in;
21+
// InputStream is = System.in;
22+
23+
// 假如Demo类下有一个变量
24+
// public static final int x;
25+
// public static final Student s;
26+
// int y = Demo.x;
27+
// Student student = Demo.s;
28+
29+
// InputStream is = System.in; //子类对象
30+
// Scanner sc = new Scanner(is);
31+
32+
Scanner sc = new Scanner(System.in);
33+
}
34+
}

‎day12/code/day12_Scanner/src/cn/itcast_02/ScannerDemo.java‎

Lines changed: 28 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,28 @@
1+
package cn.itcast_02;
2+
3+
import java.util.Scanner;
4+
5+
/*
6+
* 成员方法：
7+
* hasNextXxx():判断下一个输入项是不是指定的数据类型
8+
* nextXxx():获取该类型的数据
9+
*
10+
* 注意：
11+
* 键盘录入数据，需要的是int类型，我却给了一个字符串。
12+
* 在控制台就提示：InputMismatchException 输入不匹配异常。
13+
*
14+
*/
15+
public class ScannerDemo {
16+
public static void main(String[] args) {
17+
Scanner sc = new Scanner(System.in);
18+
19+
System.out.println("请输入一个整数：");
20+
21+
if (sc.hasNextInt()) {
22+
int number = sc.nextInt();
23+
System.out.println(number);
24+
}
25+
26+
System.out.println("over");
27+
}
28+
}

0 commit comments

Comments
 (0)