Java Language Apache Commons Lang Implement toString() method
Example
To implement the toString method of an object easily you could use the ToStringBuilder class.
Selecting the fields:
@Override
public String toString() {
ToStringBuilder builder = new ToStringBuilder(this);
builder.append(field1);
builder.append(field2);
builder.append(field3);
return builder.toString();
}
Example result:
ar.com.jonat.lang.MyClass@dd7123[<null>,0,false]
Explicitly giving names to the fields:
@Override
public String toString() {
ToStringBuilder builder = new ToStringBuilder(this);
builder.append("field1",field1);
builder.append("field2",field2);
builder.append("field3",field3);
return builder.toString();
}
Example result:
ar.com.jonat.lang.MyClass@dd7404[field1=<null>,field2=0,field3=false]
You could change the style via parameter:
@Override
public String toString() {
ToStringBuilder builder = new ToStringBuilder(this,
ToStringStyle.MULTI_LINE_STYLE);
builder.append("field1", field1);
builder.append("field2", field2);
builder.append("field3", field3);
return builder.toString();
}
Example result:
ar.com.bna.lang.MyClass@ebbf5c[
field1=<null>
field2=0
field3=false
]
There are some styles, for example JSON, no Classname, short, etc ...
Via reflection:
@Override
public String toString() {
return ToStringBuilder.reflectionToString(this);
}
You could also indicate the style:
@Override
public String toString() {
return ToStringBuilder.reflectionToString(this, ToStringStyle.JSON_STYLE);
}
