JTable table.getSelectedRows() issue

Question

我创建了一个具有定制模型和特征的JTable。我编写了一个很长的类，可以正确地执行设置和呈现。我看到.getSelectedRows()方法不工作，从来没有计算出一个值。我试图得到第一行和最后一行的索引。这是我的代码。

public void actionPerformed(ActionEvent event) {
    String command = event.getActionCommand();
    rows = table.getSelectedRows();
    firstRow = rows[0];
    int rowCount = rows.length;
    lastRow = rows[(rowCount - 1)];
    if (command.equals("Run Threw")) {
    }else if (command.equals("Shield Bash")) {
        this.attack(firstRow, lastRow, command);
    }
        public boolean block (int defendersRow) {
}
public boolean fumble (int attackersRow) {   
}
public boolean dodge (int defendersRow) {
}
public boolean critical (int attackersRow, int attackRoll) {
}

public void attack(int firstRow, int lastRow, String command) {
    command = this.command;
    firstRow = this.firstRow;
    lastRow = this.lastRow;
    if (command == "Bludgeon" || command == "React" || command == "ShieldBash") {
        attackersRow = this.lastRow;
        defendersRow = this.firstRow;
    }else if(command == "Attack" || command == "Skill") {
        attackersRow = this.firstRow;
        defendersRow = this.lastRow;
    }else {
    }
    table.setValueAt(true, attackersRow, 16);
    fumbled = this.fumble(attackersRow);
    if (fumbled == true) {
        outputString = "fumbled";
    }
    Object maxDamageObject = table.getValueAt(attackersRow, 10);
    int maxDamage = (Integer) maxDamageObject;
    attackRoll = generator.nextInt(100) + 1;
    this.critical(attackersRow, attackRoll);
    if (criticaled == true) {
        outputString = "criticaled";
    }
    dodged = this.dodge(defendersRow);
    if (dodged == true) {
        outputString = "dodged";
    }
    blocked = this.block(defendersRow);
    if (blocked == true) {
        outputString = "blocked";
    }
    int defenseRoll = generator.nextInt(100) + 1;
    Object attackBaseObject = table.getValueAt(attackersRow, 6);
    Object defenseBaseObject = table.getValueAt(defendersRow, 11);
    int attackBase = (Integer) attackBaseObject;
    int defenseBase = (Integer) defenseBaseObject;
    int attack = attackRoll + attackBase;
    int defense = defenseRoll + defenseBase;
    Object minDamageObject = table.getValueAt(attackersRow, 9);
    int minDamage = (Integer) minDamageObject;
    damage = generator.nextInt((maxDamage - minDamage))+minDamage;
    if (criticaled == true) {
        damage = maxDamage * 2;
    }else if (attack >= (defense + 50)) {
        damage = damage * 2;
    }else if (attack >= defense) {
        damage = damage;
    }else {
        damage = 0;
    }
    this.outputSelection(outputString, attackersRow, defendersRow, command, damage);
    this.damage(defendersRow, damage);
}
private void damage(int defendersRow, int damage) {
}
private void outputSelection(String outputString, int attackersRow, int defendersRow, String command, int damage) {

}

Answer 1

我不认为代码有问题。也许你可以交叉检查以下几点:

1. 您可以选择单行/多行吗?或者检查jTableObject.getRowSelectionAllowed()返回
2. 在选择行之后，您的代码是否只被调用 ?您的代码应该在选择一些行之后执行，以便它可以返回您期望的值。
3. 调用上述代码的监听器是否添加到表中

Answer 2

如本工作示例所示，您可以将ListSelectionListener添加到表的ListSelectionModel中，并查看是否有任何结果。它可以帮助确定哪里出了问题:例如，一个本地table引用掩盖了预期的引用。