基本数据类型和封装类数组初始化值的研究

准备数据：

package test1;

import java.util.HashMap;
import java.util.Map;

public class MyArray {
	//8种基本数据类型
	static byte bytes[] = new byte[5];
	static char chars[] = new char[5];
	static int ints[] = new int[5];
	static short shorts[] = new short[5];
	static long longs[] = new long[5];
	static float floats[] = new float[5];
	static double doubles[] = new double[5];
	static boolean booleans[] = new boolean[5];
	
	//10种封装类
	static Byte[] Bytes = new Byte[5];
	static Character[] Characters = new Character[5];
	static Short[] Shorts = new Short[5];
	static Integer[] Integers = new Integer[5];
	static Long[] Longs = new Long[5];
	static Float[] Floats = new Float[5];
	static Double[] Doubles = new Double[5];
	static Boolean[] Booleans = new Boolean[5];
	static String[] Strings = new String[5];
	static Object[] Objects = new Object[5];
	
	static Map<String,Object> arrayMap = new HashMap<String,Object>();
	
    public static Map<String, Object> initMap(){
    	//8种基本数据类型
		arrayMap.put("byte", bytes);
		arrayMap.put("char", chars);
		arrayMap.put("int", ints);
		arrayMap.put("short", shorts);
		arrayMap.put("long", longs);
		arrayMap.put("float", floats);
		arrayMap.put("double", doubles);
		arrayMap.put("boolean", booleans);
		//10种封装类
		arrayMap.put("Byte", Bytes);
		arrayMap.put("Character", Characters);
		arrayMap.put("Short", Shorts);
		arrayMap.put("Integer", Integers);
		arrayMap.put("Long", Longs);
		arrayMap.put("Float", Floats);
		arrayMap.put("Double", Doubles);
		arrayMap.put("Boolean", Booleans);
		arrayMap.put("String", Strings);
		arrayMap.put("Object", Objects);
		return arrayMap;
	}
}

============================================================

package test1;

import java.util.Iterator;
import java.util.Map;
import java.util.Set;

public class ArrayDefaultValue {


	public static void main(String[] args) throws Exception {

		Map<String, Object> arrayMap = MyArray.initMap();
		ArrayDefaultValue adf = new ArrayDefaultValue();
		adf.setArguments(arrayMap);

	}

	//该方法只能对封装类有效！基本数据类型的数组无法使用
	public static void printArrayDefaultValues(String key, Object[] arr) {

		for (int i = 0; i < arr.length; i++) {
		System.out.print(key + "s[" + i + "] = " + arr[i] + "; ");
		}
		System.out.println();
	}

数据类型匹配
private void setArguments(Map<String, Object> arrayMap) throws Exception {

		Set<String> mapkey = arrayMap.keySet();
		Iterator<String> it = mapkey.iterator();
		while (it.hasNext()) {
			String key = it.next();
			Object value = arrayMap.get(key);
			// System.out.println(key + "------"+value);
			System.out.println("\n" + key + ":");

			if (key.intern() == "byte") {
				byte[] arr = (byte[]) value;
				for (int i = 0; i < arr.length; i++) {
					System.out.print(key + "s[" + i + "] = " + arr[i] + "; ");
				}
				System.out.println();
//Cannot cast from byte[] to Object[],无法调用下面这个方法
				// printArrayDefaultValues(key,arr);

			} else if (key.intern() == "Byte") {
				Byte[] arr = (Byte[]) value;
				printArrayDefaultValues(key, arr);
			} else if (key.intern() == "char") {
				char[] arr = (char[]) value;
				for (int i = 0; i < arr.length; i++) {
					System.out.print(key + "s[" + i + "] = " + arr[i] + "; ");
				}
				System.out.println();
			} else if (key.intern() == "Character") {
				Character[] arr = (Character[]) value;
				printArrayDefaultValues(key, arr);
			} else if (key.intern() == "int") {
				int[] arr = (int[]) value;
				for (int i = 0; i < arr.length; i++) {
					System.out.print(key + "s[" + i + "] = " + arr[i] + "; ");
				}
				System.out.println();
			} else if (key.intern() == "Integer") {
				Integer[] arr = (Integer[]) value;
				printArrayDefaultValues(key, arr);
			} else if (key.intern() == "short") {
				short[] arr = (short[]) value;
				for (int i = 0; i < arr.length; i++) {
					System.out.print(key + "s[" + i + "] = " + arr[i] + "; ");
				}
				System.out.println();
			} else if (key.intern() == "Short") {
				Short[] arr = (Short[]) value;
				printArrayDefaultValues(key, arr);
			} else if (key.intern() == "long") {
				long[] arr = (long[]) value;
				for (int i = 0; i < arr.length; i++) {
					System.out.print(key + "s[" + i + "] = " + arr[i] + "; ");
				}
				System.out.println();
			} else if (key.intern() == "Long") {
				Long[] arr = (Long[]) value;
				printArrayDefaultValues(key, arr);
			} else if (key.intern() == "float") {
				float[] arr = (float[]) value;
				for (int i = 0; i < arr.length; i++) {
					System.out.print(key + "s[" + i + "] = " + arr[i] + "; ");
				}
				System.out.println();
			} else if (key.intern() == "Float") {
				Float[] arr = (Float[]) value;
				printArrayDefaultValues(key, arr);
			} else if (key.intern() == "double") {
				double[] arr = (double[]) value;
				for (int i = 0; i < arr.length; i++) {
					System.out.print(key + "s[" + i + "] = " + arr[i] + "; ");
				}
				System.out.println();
			} else if (key.intern() == "Double") {
				Double[] arr = (Double[]) value;
				printArrayDefaultValues(key, arr);
			} else if (key.intern() == "boolean") {
				boolean[] arr = (boolean[]) value;
				for (int i = 0; i < arr.length; i++) {
					System.out.print(key + "s[" + i + "] = " + arr[i] + "; ");
				}
				System.out.println();
			} else if (key.intern() == "Boolean") {
				Boolean[] arr = (Boolean[]) value;
				printArrayDefaultValues(key, arr);
			} else if (key.intern() == "String") {
				String[] arr = (String[]) value;
				printArrayDefaultValues(key, arr);
			} else if (key.intern() == "Object") {
				Object[] arr = (Object[]) value;
				printArrayDefaultValues(key, arr);
			} else {
				throw new RuntimeException("unkown arguments type");
			}
		}
	}


}

======================================

输出结果：

Double:

Doubles[0] = null; Doubles[1] = null; Doubles[2] = null; Doubles[3] = null; Doubles[4] = null;

Float:

Floats[0] = null; Floats[1] = null; Floats[2] = null; Floats[3] = null; Floats[4] = null;

Long:

Longs[0] = null; Longs[1] = null; Longs[2] = null; Longs[3] = null; Longs[4] = null;

char:

chars[0] = ; chars[1] = ; chars[2] = ; chars[3] = ; chars[4] = ;

int:

ints[0] = 0; ints[1] = 0; ints[2] = 0; ints[3] = 0; ints[4] = 0;

Short:

Shorts[0] = null; Shorts[1] = null; Shorts[2] = null; Shorts[3] = null; Shorts[4] = null;

Boolean:

Booleans[0] = null; Booleans[1] = null; Booleans[2] = null; Booleans[3] = null; Booleans[4] = null;

long:

longs[0] = 0; longs[1] = 0; longs[2] = 0; longs[3] = 0; longs[4] = 0;

double:

doubles[0] = 0.0; doubles[1] = 0.0; doubles[2] = 0.0; doubles[3] = 0.0; doubles[4] = 0.0;

float:

floats[0] = 0.0; floats[1] = 0.0; floats[2] = 0.0; floats[3] = 0.0; floats[4] = 0.0;

Character:

Characters[0] = null; Characters[1] = null; Characters[2] = null; Characters[3] = null; Characters[4] = null;

short:

shorts[0] = 0; shorts[1] = 0; shorts[2] = 0; shorts[3] = 0; shorts[4] = 0;

Byte:

Bytes[0] = null; Bytes[1] = null; Bytes[2] = null; Bytes[3] = null; Bytes[4] = null;

byte:

bytes[0] = 0; bytes[1] = 0; bytes[2] = 0; bytes[3] = 0; bytes[4] = 0;

String:

Strings[0] = null; Strings[1] = null; Strings[2] = null; Strings[3] = null; Strings[4] = null;

boolean:

booleans[0] = false; booleans[1] = false; booleans[2] = false; booleans[3] = false; booleans[4] = false;

Integer:

Integers[0] = null; Integers[1] = null; Integers[2] = null; Integers[3] = null; Integers[4] = null;

Object:

Objects[0] = null; Objects[1] = null; Objects[2] = null; Objects[3] = null; Objects[4] = null;

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