示例

public class ClassA {{
private final StringBuffer stringObject = new StringBuffer("A new String");
private StringBuffer nonConstantString = new StringBuffer("Changing String");

public void method(){
StringBuffer localString;
final StringBuffer localConstantString;
}
}

解决方案
使用 String 来声明 constant(final) StringBuffer 对象。

public class ClassA {{
private final String stringObject = "A new String";
private StringBuffer nonConstantString = new StringBuffer("Changing String");

public void method(){
StringBuffer localString;
final String localConstantString;
}
}