Java 二維數組的聲明及初始化

package test;

import java.util.ArrayList;

public class TestArray {
	String[] str;//成員變量，方法裏面的變量爲局部變量
	
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		TestArray testArray = new TestArray();
		//聲明數組
		testArray.str = new String[5];
		//創建數組並初始化
		testArray.str = new String[]{"1","2","3"};
		//定義數組並初始化
		String[] ss = {"1","2","3"};
		
		double[] douArray = {1,2,3,6,298,2.5};
		//計算數組之和
		double total =0;
		for(int i =0;i<douArray.length;i++) {
			total += douArray[i];
		}
		System.out.println("douArray 數組之和： "+total);
		//查找最大值
		double max =0;
		for(int i =0;i<douArray.length;i++) {
			if(douArray[i]>max)max = douArray[i];
		}
		System.out.println("max value is "+max);
		//二維數組
		String[][] stri = { {"1","2","3","4"}, {"1","2"} };
		System.out.println("stri : " + stri[1][1]);
		String[][] strin = new String[2][1];
		strin[1][0] = new String("DOOD");
		System.out.println("strin length : "+strin.length);
		String[][] string = new String[2][2];
		string[0][1] = new String("Good");
		int count = 0;
		//創建動態二維數組
		ArrayList<int[]> ayyDyn = new ArrayList<>();
		for(int i =0 ;i<2;i++) {
			//創建一維數組變量
			int[] tmpArr = new int[3];
			for(int j=0;j<tmpArr.length;j++) {
				tmpArr[j]=(++count);
			}
			//給二維數組變量賦值
			ayyDyn.add(tmpArr);
		}
		System.out.println("ayyDyn:");
		for(int[]arr:ayyDyn) {
			for(int n : arr) {
				System.out.println(n+" ");
			}
			System.out.println();
		}
		System.out.println();
	}

}