运行java程序时javac -d . Test.java，为什么用-d.

这不是运行java程序，这是编译java源码，其中：

javac是java的编译器名；-d是编译器的参数选项，用来指定生成的包目录和class文件的根目录，表示将根目录指定为当前目录；Testjava是源文件名。

假设源文件Testjava中有如下包语句：package AB;

则生成的Testclass文件保存在路径\A\B\Testclass中。

如果没有包语句，则Testclass文件保存在路径\Testclass中。

import javautilScanner;

public class TestUser {

public static void main(String[] args) {

User user = new User("Zhang san", "abcdefg");

Systemoutprintln(usertoString());

Scanner scanner = new Scanner(Systemin);

Systemoutprint("Please input old password:");

String oldPassword = scannernext();

Systemoutprint("Please input new password:");

String newPassowd = scannernext();

usersetPassword(oldPassword, newPassowd);

Systemoutprintln(usertoString());

}

}

class User{

private String userName;

private String password;

private static int userNumber = 0;

public User(){

userNumber += 1;

userName = "unknown";

password = "123456";

}

public User(String userName){

userNumber += 1;

thisuserName = userName;

password = "123456";

}

public User(String userName, String password){

userNumber+=1;

thisuserName = userName;

thispassword = password;

}

public void setPassword(String oldPassword,String newPassword){

if(oldPasswordequals(password)){

password = newPassword;

Systemoutprintln("Password set success");

}else{

Systemoutprintln("Password set not success");

}

}

public String toString(){

return "Username : " + thisuserName + ", Password: " + thispassword;

}

}

-----------------------

Username : Zhang san, Password: abcdefg

Please input old password:abcdefg

Please input new password:1234567

Password set success

Username : Zhang san, Password: 1234567

我做的有点类似但不是完全一样 发给你看看有没有启发。

public class MyPoint{

public static void main(String[] args){

MyPoint mp =new MyPoint();

mpsetStart(new Point(10,10));

mpsetEnd(new Point(20,20));

//mpsetstray(mpgetend());

mpsetStray(new Point(30,30));

Systemoutprintln(mpgetstray());

Systemoutprintln(mpgetstart());

Systemoutprintln(mpgetend());

}

private Point start;

private Point end;

private Point stray;

public Point getstart(){

return start;

}

public void setStart(Point start){

thisstart=start;

}

public Point getend(){

return end;

}

public void setEnd(Point end){

thisend=end;

}

public Point getstray(){

return stray;

}

public void setStray(Point stray){

thisstray=stray;

}

public MyPoint() {

}

public MyPoint(Point start, Point end ,Point stray) {

super();

thisstray = stray;

thisstart = start;

thisend = end;

}

}

class Point{

public String toString(){

return "x:"+ x +"y"+ y ;

}

private int x;

private int y;

public int getx(){

return x;

}

public void setx(int x){

thisx=x;

}

public int gety(){

return y;

}

public void sety(int y){

thisy=y;

}

public Point (int x,int y){

thisx=x;

thisy=y;

}

}

class Shape {

protected int length;

protected int width;

public int area(){

return lengthwidth;

}

}

class Square extends Shape{

private int length;

private int width;

public Square(int length,int width) {

thislength = length;

thiswidth = width;

}

public int area(){

return lengthwidth;

}

}

public class JavaTest {

public static void main(String[] args){

Square mySq = new Square(2,2);

Systemoutprintln(mySqarea());

}

}

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