密码游戏：错误是什么

Question

此代码不起作用。我该怎么办？

public static void main(String[] args) {
    String java = "java";
    String p = javax.swing.JOptionPane.showInputDialog("Password lives:4");
    if (p == java || java == p) {
        javax.swing.JOptionPane.showMessageDialog(null, "You are correct");
        System.exit(0);
    }
    String p1 = javax.swing.JOptionPane.showInputDialog("Password lives:3");
    if (p1 == java || java == p1) {
        javax.swing.JOptionPane.showMessageDialog(null, "You are correct");
        System.exit(0);
    }
    String p2 = javax.swing.JOptionPane.showInputDialog("Password lives:2");
    if (p2 == java || java == p2) {
        javax.swing.JOptionPane.showMessageDialog(null, "You are correct");
        System.exit(0);
    }
    String p3 = javax.swing.JOptionPane.showInputDialog("Password lives:1");
    if (p3 == java || java == p3) {
        javax.swing.JOptionPane.showMessageDialog(null, "You are correct");
        System.exit(0);
    }
    javax.swing.JOptionPane.showMessageDialog(null, "You lose");
}