“非法表达式开始”

问题描述：

有人可以帮我调试这个请。我试图回到Java，所以我不是最好的错误。这似乎是一个简单的解决方法，但是我最后一次做Java是作为高中的新生，所以我不知道该怎么做。“非法表达式开始”

import java.awt.*; 
import java.awt.event.*; 
import javax.swing.*; 
import javax.swing.JPanel.*; 
import javax.swing.JLabel.*; 
import java.util.*; 
import java.text.*; 

public class CharacterCreator extends JApplet { 



    public final String[] races = {"Human", "Dwarf"}; 
    public JComboBox<String>charRace = new JComboBox<String>(races); 
    public static void main(String[]args) 
    { 

    public final String[] classes = {"Mage", "Warrior", "Ranger"}; 
    public final JComboBox<String>charClass = new JComboBox<String>(classes); 


    int[] attPts = new int[7]; 

    JLabel pointPool = new JLabel("" + attPts[0]); 
    public final JButton STRplus = new JButton("+"); 
    public final JButton STRminus = new JButton("-"); 
    JLabel strValue = new JLabel("" + attPts[1]); 
    public final JButton CONplus = new JButton("+"); 
    public final JButton CONminus = new JButton("-"); 
    JLabel conValue = new JLabel("" + attPts[2]); 
    public final JButton DEXplus = new JButton("+"); 
    public final JButton DEXminus = new JButton("-"); 
    JLabel dexValue = new JLabel("" + attPts[3]); 
    public final JButton INTELplus = new JButton("+"); 
    public final JButton INTELminus = new JButton("-"); 
    JLabel intelValue = new JLabel("" + attPts[4]); 

    public final String[] bonusAtt = {"Strength", "Constitution", "Dexterity", 
    "Intelligence"}; 
    public JComboBox<String>humanAtt = new JComboBox<String>(bonusAtt); 
    } 

    public CharacterCreator() { 


    JPanel asPanel = new JPanel(); 
    asPanel.setLayout(new GridLayout(6, 1)); 
    asPanel.add(new JLabel("Strength")); 
    asPanel.add(new JLabel("Constitution")); 
    asPanel.add(new JLabel("Dexterity")); 
    asPanel.add(new JLabel("Intelligence")); 



    JPanel mpPanel = new JPanel(); 
    mpPanel.setLayout(new GridLayout(6, 1)); 
    mpPanel.add(strValue); 
    mpPanel.add(conValue); 
    mpPanel.add(dexValue); 
    mpPanel.add(intelValue); 



    JPanel abPanel = new JPanel(); 
    abPanel.setLayout(new GridLayout(6, 2)); 
    abPanel.add(STRplus); 
    abPanel.add(STRminus); 
    abPanel.add(CONplus); 
    abPanel.add(CONminus); 
    abPanel.add(DEXplus); 
    abPanel.add(DEXminus); 
    abPanel.add(INTELplus); 
    abPanel.add(INTELminus); 



    JPanel attributes = new JPanel(); 
    attributes.add(new JLabel("Ability Score"), BorderLayout.NORTH); 
    attributes.add(asPanel, BorderLayout.WEST); 
    attributes.add(mpPanel, BorderLayout.CENTER); 
    attributes.add(abPanel, BorderLayout.EAST); 
    attributes.add(humanAtt, BorderLayout.SOUTH); 

    JPanel masterPanel = new JPanel(); 
    masterPanel.setLayout(new GridLayout(6, 1)); 
    masterPanel.add(new JLabel("Pick your race")); 
    masterPanel.add(charRace); 
    masterPanel.add(new JLabel("Pick your Class")); 
    masterPanel.add(charClass); 
    masterPanel.add(new JLabel("Customize your ability points")); 
    masterPanel.add(attributes); 

    STRplus.addActionListener((ActionEvent e) -> { 
     attPts[0] = subPool(attPts[0], attPts[1]); 
     attPts[1] = increaseAtt(attPts[1]); 
    }); 

    STRminus.addActionListener((ActionEvent e) -> { 
     attPts[0] = addPool(attPts[0], attPts[1]); 
     attPts[1] = decreaseAtt(attPts[1]); 
    }); 

    CONplus.addActionListener((ActionEvent e) -> { 
     attPts[0] = subPool(attPts[0], attPts[2]); 
     attPts[2] = increaseAtt(attPts[2]); 
    }); 

    CONminus.addActionListener((ActionEvent e) -> { 
     attPts[0] = addPool(attPts[0], attPts[2]); 
     attPts[2] = decreaseAtt(attPts[2]); 
    }); 

    DEXplus.addActionListener((ActionEvent e) -> { 
     attPts[0] = subPool(attPts[0], attPts[3]); 
     attPts[3] = increaseAtt(attPts[3]); 
    }); 

    DEXminus.addActionListener((ActionEvent e) -> { 
     attPts[0] = addPool(attPts[0], attPts[3]); 
     attPts[3] = decreaseAtt(attPts[3]); 
    }); 

    INTELplus.addActionListener((ActionEvent e) -> { 
     attPts[0] = subPool(attPts[0], attPts[4]); 
     attPts[4] = increaseAtt(attPts[4]); 
    }); 

    INTELminus.addActionListener((ActionEvent e) -> { 
     attPts[0] = addPool(attPts[0], attPts[4]); 
     attPts[4] = decreaseAtt(attPts[4]); 
    }); 


    charRace.addItemListener((ItemEvent e) -> { 
     int[] attPts1 = {32, 8, 8, 8, 8, 8, 8}; 
     if ((charRace.getSelectedIndex()) == 0) { 
      humanAtt.setVisible(false); 
      attPts1[1] = (attPts1[1] + 2); 
     } 
     if (((charRace.getSelectedIndex()) == 1) || ((charRace.getSelectedIndex()) == 4)) { 
      humanAtt.setVisible(false); 
      attPts1[2] = (attPts1[2] + 2); 
     } 
    }); 
    } 

    public int subPool(int pool, int att) { 

    if (att == 18) 
     pool = pool - 0; 
    else { 
     if (att == 17) 
      pool = pool - 4; 
     else { 
      if (att == 16) 
      pool = pool - 3; 
      else { 
      if (att > 12) 
       pool = pool - 2; 
      else 
       pool = pool - 1; 
      } 
     } 
    } 

    return pool; 
    } 

    public int addPool(int pool, int att) { 

    if (att == 18) 
     pool = pool + 4; 
    else { 
     if (att == 17) 
      pool = pool + 3; 
     else { 
      if (att > 13) 
      pool = pool + 2; 
      else { 
      if (att > 8) 
       pool = pool - 2; 
      else 
       pool = pool - 0; 
      } 
     } 
    } 

    return pool; 
    } 

    public int increaseAtt(int att) { 

    if (att < 18) 
     att++; 

    return att; 
    } 

    public int decreaseAtt(int att) { 

    if (att > 8) 
     att = att - 1; 

    return att; 
    } 
}

它给了我是

Main.java:18: error: illegal start of expression 
    public final String[] classes = {"Mage", "Warrior", "Ranger"}; 
^
Main.java:19: error: illegal start of expression 
    public final JComboBox<String>charClass = new JComboBox<String>(classes); 
^
Main.java:25: error: illegal start of expression 
    public final JButton STRplus = new JButton("+"); 
^
Main.java:26: error: illegal start of expression 
    public final JButton STRminus = new JButton("-"); 
^
Main.java:28: error: illegal start of expression 
    public final JButton CONplus = new JButton("+"); 
^
Main.java:29: error: illegal start of expression 
    public final JButton CONminus = new JButton("-"); 
^
Main.java:31: error: illegal start of expression 
    public final JButton DEXplus = new JButton("+"); 
^
Main.java:32: error: illegal start of expression 
    public final JButton DEXminus = new JButton("-"); 
^
Main.java:34: error: illegal start of expression 
    public final JButton INTELplus = new JButton("+"); 
^
Main.java:35: error: illegal start of expression 
    public final JButton INTELminus = new JButton("-"); 
^
Main.java:38: error: illegal start of expression 
    public final String[] bonusAtt = {"Strength", "Constitution", "Dexterity", 
^
Main.java:40: error: illegal start of expression 
    public JComboBox<String>humanAtt = new JComboBox<String>(bonusAtt);

如果你能在正确的方向指向我，那将是极大的赞赏

的访问说明符的方法中都没有使用，那是你的'主（）'方法在做什么。 – YoungHobbit

'公共静态无效main（）'是一种方法，这意味着访问说明符是不必要的和非法的，例如方法启动前的'public static String'和方法内部的'String'。 –

答

你试图声明一个方法内部成员字段中的错误。你不能那样做。

public static void main(String[]args) 
{ 
    public final String[] classes = {"Mage", "Warrior", "Ranger"}; 
    ...

变量应该是成员变量，如果它们是该类的一个实例的属性，可由该类的所有成员访问。如果仅在一次调用某个方法时使用它们，它们应该是局部变量。

如果你打算声明局部变量，他们不需要访问控制。局部变量只能从方法定义中访问。删除public。

public static void main(String[]args) 
{ 
    final String[] classes = {"Mage", "Warrior", "Ranger"}; 
    ...

如果你打算声明成员变量，他们不能在main()方法内部声明。将它们移出。

final String[] classes = {"Mage", "Warrior", "Ranger"}; 
... 

public static void main(String[]args) 
{ 
    ...

我最初根本没有main（）方法，我试图在网上查找它，并且说它添加它并且程序应该运行良好。有我应该去的地方吗？ – xAnghellic

您可以按照成员数据和方法的顺序将'main（）'放在任意位置。但是你需要1）决定你想要它做什么，2）将成员声明移到它之外，3）从局部变量中删除'public'。通常，main（）方法将创建该类的一个实例（例如'new CharacterCreator（）'），并调用它的方法。 –

答

你不能公开声明的方法：

public final String[] classes = {"Mage", "Warrior", "Ranger"}; 
public final JComboBox<String>charClass = new JComboBox<String>(classes); 
public final JButton STRplus = new JButton("+"); 
public final JButton STRminus = new JButton("-"); 
public final JButton CONplus = new JButton("+"); 
public final JButton CONminus = new JButton("-"); 
public final JButton DEXplus = new JButton("+"); 
public final JButton DEXminus = new JButton("-"); 
public final JButton INTELplus = new JButton("+"); 
public final JButton INTELminus = new JButton("-"); 
public final String[] bonusAtt = {"Strength", "Constitution", "Dexterity", 
"Intelligence"}; 
public JComboBox<String>humanAtt = new JComboBox<String>(bonusAtt);

将其更改为：

String[] classes = {"Mage", "Warrior", "Ranger"}; 
JComboBox<String>charClass = new JComboBox<String>(classes); 
JButton STRplus = new JButton("+"); 
JButton STRminus = new JButton("-"); 
JButton CONplus = new JButton("+"); 
JButton CONminus = new JButton("-"); 
JButton DEXplus = new JButton("+"); 
JButton DEXminus = new JButton("-"); 
JButton INTELplus = new JButton("+"); 
JButton INTELminus = new JButton("-"); 
String[] bonusAtt = {"Strength", "Constitution", "Dexterity", 
"Intelligence"}; 
JComboBox<String>humanAtt = new JComboBox<String>(bonusAtt);

这应该可以解决的编译错误。如果你想让它们成为类变量，那么将它们移到main之外，这也应该修复你的错误。

那么将该方法与我拥有的方法放在一起的理想地点在哪里？将取出这2个修复所有的错误即将获得？ – xAnghellic

为你的情况使用我已经提供的解决方案，因为你不需要然后成为课堂级别。 – StackFlowed

答

你不能有一个方法内访问修饰符：

下面，从您的代码段，是错误的：

public static void main(String[]args) 
{ 

    public final String[] classes = {"Mage", "Warrior", "Ranger"};

解决方案：

采取这些东西了的main方法。
删除访问修饰符（在你的情况下，删除public）

哪里可以把我的方法放在最好的地方？ – xAnghellic

对于像'charClass'，'STRplus'等所有变量，您在错误中看到的只是将它们全部放在'main'之前。 – Abubakkar

“非法表达式开始”

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