Guava Eclipse Plugin - Preference Page Settings results explained

Guava Eclipse Plugin Preferences

Use MoreObjects in toString Method (requires guava 18.0)

selected

package net.sf.guavaeclipse.test;

import com.google.common.base.MoreObjects;

public class SampleSimple {

  private int intValue;

  private String strValue;

  @Override
  public String toString() {
    return MoreObjects.toStringHelper(this)
        .add("intValue", intValue)
        .add("strValue", strValue)
        .toString();
  }

}

deselected

package net.sf.guavaeclipse.test;

import com.google.common.base.Objects;

public class SampleSimple {

  private int intValue;

  private String strValue;

  @Override
  public String toString() {
    return Objects.toStringHelper(this)
        .add("intValue", intValue)
        .add("strValue", strValue)
        .toString();
  }

}

super method behavior

Use super class Methods (toString(), equals() and hashCode())

package net.sf.guavaeclipse.test;

import com.google.common.base.Objects;
import com.google.common.base.MoreObjects;

public class SampleSimple {

  private int intValue;

  private String strValue;

  @Override
  public String toString() {
    return MoreObjects.toStringHelper(this)
        .add("super", super.toString())
        .add("intValue", intValue)
        .add("strValue", strValue)
        .toString();
  }

  @Override
  public int hashCode() {
    return Objects.hashCode(super.hashCode(), intValue, strValue);
  }

  @Override
  public boolean equals(Object object) {
    if (object instanceof SampleSimple) {
      if (!super.equals(object))
        return false;
      SampleSimple that = (SampleSimple) object;
      return Objects.equal(this.intValue, that.intValue)
          && Objects.equal(this.strValue, that.strValue);
    }
    return false;
  }
  
}

Don't use super class Methods (toString(), equals() and hashCode())

package net.sf.guavaeclipse.test;

import com.google.common.base.MoreObjects;
import com.google.common.base.Objects;

public class ClassExtendsSomeComparable extends ClassWithComparable {

  private int intValue2;

  public int getIntValue2() {
    return intValue2;
  }

  public void setIntValue2(int intValue2) {
    this.intValue2 = intValue2;
  }

  @Override
  public String toString() {
    return MoreObjects.toStringHelper(this).add("intValue2", intValue2).toString();
  }

  @Override
  public int hashCode() {
    return Objects.hashCode(intValue2);
  }

  @Override
  public boolean equals(Object object) {
    if (object instanceof ClassExtendsSomeComparable) {
      ClassExtendsSomeComparable that = (ClassExtendsSomeComparable) object;
      return Objects.equal(this.intValue2, that.intValue2);
    }
    return false;
  }

}

Use super class Methods (Only if superclass is not "java.lang.Object")

example one

package net.sf.guavaeclipse.test;

import com.google.common.base.Objects;
import com.google.common.base.MoreObjects;

public class SampleSimple {

  private int intValue;

  private String strValue;

  @Override
  public String toString() {
    return MoreObjects.toStringHelper(this).add("intValue", intValue).add("strValue", strValue)
        .toString();
  }

  @Override
  public int hashCode() {
    return Objects.hashCode(intValue, strValue);
  }

  @Override
  public boolean equals(Object object) {
    if (object instanceof SampleSimple) {
      SampleSimple that = (SampleSimple) object;
      return Objects.equal(this.intValue, that.intValue)
          && Objects.equal(this.strValue, that.strValue);
    }
    return false;
  }
  
}

example two

package net.sf.guavaeclipse.test;

import com.google.common.base.MoreObjects;
import com.google.common.base.Objects;

public class ClassExtendsSomeComparable extends ClassWithComparable {

  private int intValue2;

  public int getIntValue2() {
    return intValue2;
  }

  public void setIntValue2(int intValue2) {
    this.intValue2 = intValue2;
  }

  @Override
  public String toString() {
    return MoreObjects.toStringHelper(this).add("super", super.toString())
        .add("intValue2", intValue2).toString();
  }

  @Override
  public int hashCode() {
    return Objects.hashCode(super.hashCode(), intValue2);
  }

  @Override
  public boolean equals(Object object) {
    if (object instanceof ClassExtendsSomeComparable) {
      if (!super.equals(object))
        return false;
      ClassExtendsSomeComparable that = (ClassExtendsSomeComparable) object;
      return Objects.equal(this.intValue2, that.intValue2);
    }
    return false;
  }

}

Guava Eclipse Plugin Preferences

Guava Eclipse Plugin Equals/HashCode Preferences

Use java.util.Objects in equals/hashCode Methods (require JDK1.7 or higher)

selected

package net.sf.guavaeclipse.test;

import java.util.Objects;

public class SampleSimple {

	private int intValue;

	private String strValue;

	@Override
	public int hashCode() {
		return Objects.hash(intValue, strValue);
	}

	@Override
	public boolean equals(Object object) {
		if (object instanceof SampleSimple) {
			SampleSimple that = (SampleSimple) object;
			return this.intValue == that.intValue && Objects.equals(this.strValue, that.strValue);
		}
		return false;
	}

}

deselected

package net.sf.guavaeclipse.test;

import com.google.common.base.Objects;

public class SampleSimple {

	private int intValue;

	private String strValue;

	@Override
	public int hashCode() {
		return Objects.hashCode(intValue, strValue);
	}

	@Override
	public boolean equals(Object object) {
		if (object instanceof SampleSimple) {
			SampleSimple that = (SampleSimple) object;
			return this.intValue == that.intValue && Objects.equal(this.strValue, that.strValue);
		}
		return false;
	}

}

For primitives don't use Objects method in equals() to avoid casting

selected

package net.sf.guavaeclipse.test;

import java.util.Objects;

public class SampleSimple {

	private int intValue;

	private String stringValue;
	
	@Override
	public int hashCode() {
		return Objects.hash(intValue, stringValue);
	}

	@Override
	public boolean equals(Object object) {
		if (object instanceof SampleSimple) {
			SampleSimple that = (SampleSimple) object;
			return this.intValue == that.intValue && Objects.equals(this.stringValue, that.stringValue);
		}
		return false;
	}

}

deselected

package net.sf.guavaeclipse.test;

import java.util.Objects;

public class SampleSimple {

	private int intValue;

	private String stringValue;
	
	@Override
	public int hashCode() {
		return Objects.hash(intValue, stringValue);
	}

	@Override
	public boolean equals(Object object) {
		if (object instanceof SampleSimple) {
			SampleSimple that = (SampleSimple) object;
			return Objects.equals(this.intValue, that.intValue) && Objects.equals(this.stringValue, that.stringValue);
		}
		return false;
	}

}

instanceOf or class equality check

use instanceOf in equals()

package net.sf.guavaeclipse.test;

import java.util.Objects;

public class SampleSimple {

	private int intValue;

	private String strValue;

	@Override
	public int hashCode() {
		return Objects.hash(intValue, strValue);
	}

	@Override
	public boolean equals(Object object) {
		if (object instanceof SampleSimple) {
			SampleSimple that = (SampleSimple) object;
			return this.intValue == that.intValue && Objects.equals(this.strValue, that.strValue);
		}
		return false;
	}

}

use class equality

package net.sf.guavaeclipse.test;

import java.util.Objects;

public class SampleSimple {

	private int intValue;

	private String stringValue;
	
	@Override
	public int hashCode() {
		return Objects.hash(intValue, stringValue);
	}

	@Override
	public boolean equals(Object object) {
		if (object != null && getClass() == object.getClass()) {
			SampleSimple that = (SampleSimple) object;
			return this.intValue == that.intValue && Objects.equals(this.stringValue, that.stringValue);
		}
		return false;
	}

}

use fields directly or use getter methods in equals and hashCode

use fields

package net.sf.guavaeclipse.test;

import java.util.Objects;

public class SampleSimple {

	private int intValue;

	private String strValue;

	@Override
	public int hashCode() {
		return Objects.hash(intValue, strValue);
	}

	@Override
	public boolean equals(Object object) {
		if (object instanceof SampleSimple) {
			SampleSimple that = (SampleSimple) object;
			return this.intValue == that.intValue && Objects.equals(this.strValue, that.strValue);
		}
		return false;
	}

}

use getter methods

it uses only exisitng getter methods. if a field is selected but doesn't have a getter method if will use the field directly

package net.sf.guavaeclipse.test;

import java.util.Objects;

public class SampleSimple {

	private int intValue;

	private String strValue;

	public String getStrValue() {
		return strValue;
	}

	@Override
	public int hashCode() {
		return Objects.hash(intValue, getStrValue());
	}

	@Override
	public boolean equals(Object object) {
		if (object instanceof SampleSimple) {
			SampleSimple that = (SampleSimple) object;
			return this.intValue == that.intValue && Objects.equals(this.getStrValue(), that.getStrValue());
		}
		return false;
	}

}