Override toString

Straight up Java

A class

class OverrideTooStringWithJava {
        
    private String capital = null;
    private String stateCode = null;
    
    @Override
    public String toString() {
        
        StringBuffer sb = new StringBuffer();
        sb.append("state capital ");
        sb.append(capital);
        sb.append(" , ");
        sb.append("state code ");
        sb.append(stateCode);
        
        return sb.toString();
    }

    public void setCapital(String capital) {
        this.capital = capital;
    }

    public void setStateCode(String stateCode) {
        this.stateCode = stateCode;
    }
}

Unit test

@Test 
public void override_toString_With_java () {
    OverrideTooStringWithJava overrideTooString = new OverrideTooStringWithJava();
    overrideTooString.setCapital(CAPITAL);
    overrideTooString.setStateCode(STATE_CODE);

    assertEquals("state capital Madison , state code WI", overrideTooString.toString());
    
}

Google Guava

A class

class OverrideToStringWithGuava {
    
    private String capital = null;
    private String stateCode = null;
    
    @Override
    public String toString() {
        return Objects.toStringHelper(this)
                .add("state capital", capital)
                .add("state code", stateCode)
                .toString();
    }

    public void setCapital(String capital) {
        this.capital = capital;
    }

    public void setStateCode(String stateCode) {
        this.stateCode = stateCode;
    }
    
}

Unit test

@Test 
public void override_toString_with_guava () {
    OverrideToStringWithGuava guavaOverrideToString = new OverrideToStringWithGuava();
    guavaOverrideToString.setCapital(CAPITAL);
    guavaOverrideToString.setStateCode(STATE_CODE);

    assertEquals("OverrideToStringWithGuava{state capital=Madison, state code=WI}", guavaOverrideToString.toString());
}

Apache Commons

A class

class OverrideToStringWithApacheCommons {
    
    private String capital = null;
    private String stateCode = null;
    
    @Override
    public String toString() {

        return new ToStringBuilder(this).
                   append("state capital", capital).
                   append("state code", stateCode).
                   toString();
        
    }

    public void setCapital(String capital) {
        this.capital = capital;
    }

    public void setStateCode(String stateCode) {
        this.stateCode = stateCode;
    }
}

Unit test

@Test 
public void override_toString_with_apachecommons () {
    OverrideToStringWithApacheCommons apacheCommonsToString = new OverrideToStringWithApacheCommons();
    apacheCommonsToString.setCapital(CAPITAL);
    apacheCommonsToString.setStateCode(STATE_CODE);

    assertTrue(apacheCommonsToString.toString().contains("[state capital=Madison,state code=WI]"));
}