change_states.java

public final void changeMass(final int n) {
    this.setState("mass", this.getState("mass", 0) + n);
}

public final void changeHappy(final int n) {
    this.setState("happy", this.getState("happy", 0) + n);
}

public final void changeClean(final int n) {
    this.setState("clean", this.getState("clean", 0) + n);
}