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java输出代码本身 java输入输出代码
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为什么这段Java代码会有输出？
System.out.println（）是输出
你创建A的对象，A类的static段代码是在对象初始化时调用的
有必要给你说对象创建：
首先创建成员变量初始化为0，然后对他赋值，再这里static优先于普通变量。
再是调用代码块，也是static 优先于普通代码块
在是构造函数
相关问答
Q1: 求JAVA高手，输出两段代码
public class MyDate {
private int year;
private int month;
private int date;
public MyDate(int year, int month, int date) {
this.year = year;
this.month = month;
this.date = date;
}
public MyDate() {
}
public int getYear() {
return year;
}
public void setYear(int year) {
this.year = year;
}
public int getMonth() {
return month;
}
public void setMonth(int month) {
this.month = month;
}
public int getDate() {
return date;
}
public void setDate(int date) {
this.date = date;
}
@Override
public String toString() {
return new StringBuilder().append(year).append("-").append(month).append("-").append(date).toString();
}
public static void main(String[] args) {
MyDate myDate = new MyDate();
myDate.setYear(2015);
myDate.setMonth(9);
myDate.setDate(16);
System.out.println(myDate);
System.out.println(new MyDate(2015, 9, 16));
}
}
public static void main(String[] args) {
try {
File file = new File("D:\\farrago.txt");
File descFile = new File("D:\\out.txt");
InputStream is = new FileInputStream(file);
OutputStream os = new FileOutputStream(descFile);
byte[] buffer = new byte[1024];
int n;
while ((n = is.read(buffer)) != -1) {
os.write(buffer, 0, n);
}
is.close();
os.flush();
os.close();
} catch (Exception e) {
// TODO: handle exception
}
}
Q2: java输入输出流与文件，求源代码！感谢大佬！
你好，java的API中提供了用于对象输入输出文件的操作，实例代码如下：
定义单词类如下(注意：你定义的类要实现Serializable接口)
public class Words implements Serializable {
private int size;
private String[] words;
public Words(){};
public Words(String...strs){
this.words = strs;
this.size = strs.length;
}
@Override
public String toString() {
return "Words{" +
"size=" + size +
", words=" + Arrays.toString(words) +
'}';
}
}
2. 对象输入输出api测试类
public class ObjIOTest {
public static void main(String[] args) {
String path = "d:/myIOTest.txt";
ObjIOTest objIOTest = new ObjIOTest();
Words words = new Words("hello", "my", "dear", "friend");
try {
objIOTest.writeObject(path,words);
Words wordsFromFile = (Words)objIOTest.readObject(path);
System.out.println(wordsFromFile.toString());
} catch (IOException | ClassNotFoundException e) {
e.printStackTrace();
}
}
//java serialize a object to file
public void writeObject(String path,Object map) throws IOException{
File f=new File(path);
FileOutputStream out=new FileOutputStream(f);
ObjectOutputStream objwrite=new ObjectOutputStream(out);
objwrite.writeObject(map);
objwrite.flush();
objwrite.close();
}
// read the object from the file
public Object readObject(String path) throws IOException, ClassNotFoundException{
FileInputStream in=new FileInputStream(path);
ObjectInputStream objread=new ObjectInputStream(in);
Object map=objread.readObject();
objread.close();
return map;
}
}
把两段代码拷贝到一个包下即可运行了，希望您的问题得到解答
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