我正在编写一个小游戏以供我娱乐，而且我遇到的问题是将一个类中的变量从另一个类中的值中更改。我实际上已经在另一个不是主要的课程中完成了这个。我在运行时遇到的错误是我需要将main() main(String[] args)改为main(int wgold)。
import java.io.*;
class player {
public static void main (String[] args) throws IOException { // <<<<<<<<<<<<<<<<<<<<< Need to have this get the value sent
String Name, cmd;
int gold, quit, spaces, weint, randGold;
gold = 0;
cmd = "none";
quit = 0;
spaces = 0;
weint = 0;
/* Ideas for new commands:
attack - Attacks monster you have run into. - 100%
eat - Heals you. - 0%
run - Gets you away from a battle. - 100%
walk - Moves you one space and you can: find something (gold, food, ect...) or run into a monster. - 50%
*/
while (quit == 0) {
gold += wgold; // <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< This is the setting of the gold after the battle >>>>>>>>>>>>>>>>>>>>>>>
wgold = 0;
if (cmd.equalsIgnoreCase("none")) {
System.out.println("-------Commands-------\n");
System.out.println("distance - Displays the amount of spaces you have walked.");
System.out.println("gold - Shows the amount of gold you have.");
System.out.println("quit - Exits the program.");
System.out.println("walk - Moves you one space.\n");
System.out.println("--End of command list--\n");
cmd = "wait";
BufferedReader stdin = new BufferedReader (new InputStreamReader (System.in));
System.out.print("Command: ");
System.out.flush();
cmd = stdin.readLine();
}
if (cmd.equalsIgnoreCase("gold")) {
System.out.println("\nGold: " + gold + "\n");
cmd = "none";
}else if (cmd.equalsIgnoreCase("walk")) {
spaces += 1;
weint = misc.random(1000); // Sets a random number out of 1000 for a percentage.
if ((weint >= 0) & (weint < 300)) {
enemies obj = new enemies();
obj.main();
cmd = "none";
} else if ((weint >= 300) & (weint < 500)) {
randGold = misc.random(10); // Sets the random amount of gold found while walking.
if (randGold <= 0) {
randGold = 1;
}
System.out.println("\nYou have walked one space and found " + randGold + " gold piece(s).\n");
gold += randGold;
cmd = "none";
} else if ((weint >= 500) & (weint <= 1000)) {
System.out.println("\nYou have walked one space.\n");
cmd = "none";
}
} else if (cmd.equalsIgnoreCase("distance")) {
System.out.println("\nSpaces you have moved: " + spaces + ".\n");
cmd = "none";
} else if (cmd.equalsIgnoreCase("quit")) {
System.out.println("Quitting the program...");
quit = 1;
} else {
System.out.println("\nCommand not recognized.\n");
cmd = "none";
}
}
}
}
class battle {
public static void main(String monster, int level, int mhp, int drop) throws IOException { // (String monster) gets the return value of the monster sent by the enemies class.
int end, hp, str, smhp, exp;
Long hit;
String cmd;
end = 0;
hp = 10;
str = 1;
exp = 0;
smhp = mhp;
cmd = "none";
System.out.println("\n\n\n-------Battle!-------\n\n\n");
System.out.println("You've encountered a wild " + monster + " level " + level + "!\n\n");
while(end == 0) {
if(cmd.equalsIgnoreCase("none")) {
System.out.println("----Commands----\n");
System.out.println("attack - Attacks the enemy.");
System.out.println("run - Runs from battle.\n");
System.out.println("--End of command list--\n\n\n");
System.out.println("-----Status----\n");
System.out.println("HP: " + hp + "/10");
System.out.println("Strength: " + str + "\n");
System.out.println("---Wild " + monster + " stats---");
System.out.println("Wild " + monster + " HP: " + mhp + "/" + smhp + "\n");
cmd = "wait";
BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
System.out.print("Command: ");
System.out.flush();
cmd = stdin.readLine();
}
if(cmd.equalsIgnoreCase("run")) {
System.out.println("\nYou have escaped from the battle!\n");
end = 1;
} else if(cmd.equalsIgnoreCase("attack")) {
hit = Math.round(misc.random(str) * .7);
System.out.println("You hit: " + hit);
mhp -= hit;
if(hit >= 1) {
exp += hit * 12;
}
cmd = "none";
//Add HP for monsters / attack command. Not all here but you know where...
} else {
System.out.println("\nCommand not recognized.\n");
cmd = "none";
}
if(mhp <= 0) {
System.out.println("You have won!");
System.out.println("You found: " + drop + " coins!");
player obj = new player(); // <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< This is where the value is sent to the player class
obj.main(drop);
if(exp >= str * 80) {
str += 1;
System.out.println("Congradulations! You now have " + str + " strength.");
}
end = 1;
}
}
}
}
class enemies {
public static void main() throws IOException {
String monster;
int drop, level, mint, mhp;
mint = misc.random(10);
if (mint >= 7) {
monster = "Goblin";
} else {
monster = "Wizard";
}
battle obj = new battle(); // calls the battle class
level = misc.random(3); // Makes a random level for the enemy.
mhp = level + 3;
drop = misc.random(level);
if(drop <= 0) {
drop = 1;
}
drop = drop * 3;
obj.main(monster, level, mhp, drop); // sends the String monster to the battle class.
}
}
我知道我的代码很乱，可能有很多我可以做的事情不同，但我现在只是在学习。任何帮助都将非常感激。
此代码也可在此处找到：http://pastebin.com/kjuD3GJd
答案 0 :(得分：3)
您需要对Main类的实例的引用。以下代码中的某些内容（包含拼写错误）
public class Main{
public static void main (String[] args){
new Main().start();
}
public void start(){
new OtherClass(this).doSomething();
}
public void whatever(){...}
}
public class OtherClass{
private final Main main;
public OtherClass(Main aMain){
main = aMain;
}
public void doSomething{
main.whatever();
}
}
在whatever方法中，您可以访问Main实例的所有状态。当然你也可以传递参数。
关于您的其他隐式问题：要启动程序，您必须使用static void main(String[] args)方法。别的什么都不行。当然你可以有任意的其他方法，包括一些同名的方法，虽然我建议为初学者使用唯一的名字。这可以避免编译器混淆你抱怨它的方法。
作为一个附加组件，在这里提出一些问题的建议：将您的代码复制（*）到一个新项目。然后删除不必要的所有内容以了解您的问题。在10个案例中的9个案例中，您将在此过程中找到问题的解决方案。在最后一种情况下，您有一个人们正在查看的代码示例，从而产生更好的答案。
（*）而不是复制版本控制系统的使用，例如推荐，但我想你还没有。
答案 1 :(得分：0)
每个班级都不需要主方法。你可以通过将方法重命名为任何其他东西然后调用它来解决问题。
静态方法不需要对象实例：
public class MainClass {
/* args is the array of string commands passed as arguments
when the program is invoked */
public static void main(String[] args) {
MyClass objRef = new MyClass();
System.out.println(MyClass.myStaticMethod());
//System.out.println(MyClass.nonStaticMethod()); // Cannot access a non-static method without an instance.
System.out.write(objRef.nonStaticMethod());
}
}
class MyClass {
public static int myStaticMethod() {
return 1;
}
public int nonStaticMethod() {
return 2;
}
}
每个文件只应该有一个公共类，并且此文件必须与公共类同名。