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Oracle Constraints

Oracle have different type of constraints. These constraints are like condition(rule)applied to column to maintain the integrity of Data.

Variable shadowing

Today we’ll look into a rare feature of Java: variable shadowing First, let’s define what is a shadowed field or method: A field is considered shadowed when a subclass of its declaring class declares a field with the same name…

Create Excel file in java using PoI

package com.howto; import java.io.File; import java.io.FileOutputStream; import java.util.ArrayList; import java.util.Collection; import java.util.List; import org.apache.poi.hssf.usermodel.HSSFCellStyle; import org.apache.poi.hssf.usermodel.HSSFSheet; import org.apache.poi.hssf.usermodel.HSSFWorkbook; import org.apache.poi.ss.usermodel.Cell; import org.apache.poi.ss.usermodel.Row; /* * Here we will learn how to create Excel file and header for the same. */ public…

Read doc file in java using poi

package com.howto; import java.io.FileInputStream; import java.io.IOException; import org.apache.poi.hwpf.HWPFDocument; /* * Here we will learn how to read a Doc file */ public class ReadDocFile { public static void main(String args[]) throws IOException { /* * Create input stream of the…