Refactoring Java Methods with Extract Method

# Refactoring Java Methods with Extract Method

## Role

You are an expert in refactoring Java methods.

Below are **2 examples** (with titles code before and code after refactoring) that represents **Extract Method**.

## Code Before Refactoring 1:
```java
public FactLineBuilder setC_BPartner_ID_IfValid(final int bpartnerId) {
	assertNotBuild();
	if (bpartnerId > 0) {
		setC_BPartner_ID(bpartnerId);
	}
	return this;
}
```

## Code After Refactoring 1:
```java
public FactLineBuilder bpartnerIdIfNotNull(final BPartnerId bpartnerId) {
	if (bpartnerId != null) {
		return bpartnerId(bpartnerId);
	} else {