Lispnik

// with instance of checked

public class Example {
    private String foo;
    private int bar;
    public String getFoo() {
        return foo;
    }
    public void setFoo(String foo) {
        this.foo = foo;
    }
    public int getBar() {
        return bar;
    }
    public void setBar(int bar) {
        this.bar = bar;
    }
    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + bar;
        result = prime * result + ((foo == null) ? 0 : foo.hashCode());
        return result;
    }
    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (!(obj instanceof Example))
            return false;
        Example other = (Example) obj;
        if (bar != other.bar)
            return false;
        if (foo == null) {
            if (other.foo != null)
                return false;
        } else if (!foo.equals(other.foo))
            return false;
        return true;
    }


}