public class CharacterStatsGUI extends javax.swing.JFrame {

static int skill1 = 1;
static int skill2 = 1;
static int skill3 = 1;
static int skill4 = 1;
static int skill5 = 1;
static int skill6 = 1;

static int skillPoints = 10;

private void txthealthActionPerformed(java.awt.event.ActionEvent evt) {
    // TODO add your handling code here:
    txthealth.setText(String.valueOf(skill1));
}

private void btnhpActionPerformed(java.awt.event.ActionEvent evt) {
    // TODO add your handling code here:
    if(skillPoints >= 1){
    skill1++;
    skillPoints--;
    txthealth.setText(String.valueOf(skill1));
    txtpoints.setText(String.valueOf(skillPoints));
    }
    else{
        JOptionPane.showMessageDialog(null, "You dont have enough skills points");
    }


}

private void btnhmActionPerformed(java.awt.event.ActionEvent evt) {
    // TODO add your handling code here:
    if(skillPoints >= 0 && skill1 > 1){
    skill1--;
    skillPoints++;
    txthealth.setText(String.valueOf(skill1));
     txtpoints.setText(String.valueOf(skillPoints));
    }
    else{
        JOptionPane.showMessageDialog(null, "Minimum skill value is 1.");
    }

}