JAVA08

2차원 배열 

선언 
자료형 [][] 배열명 = new 자료형[행][열];
자료형 [][] 배열명{
                       {값1,값2..},
                       {값3,값4..}
};

 

2차원 배열 예제

package day10;

import javax.swing.JOptionPane;

public class ArrShop {

	public static void main(String[] args) {
		int[][] arrIncome=new int[2][3];
		int [] arASum=new int[2]; //연령별 총매출
		int [] arBSum=new int[3]; //매장별 총매출
		int sum=0;
		int rLength = arrIncome.length;
		int cLength = arrIncome[0].length;
		double [] aAvg=new double[2];
		double [] bAvg=new double[3];
		double avg=0.0;		
		
		String [] arAName= {"성인","키즈"};
		String arBName[]= {"강남점","홍대점","신촌점"};
		String result="";
		String [][] arrName = {
				{"강남점A","홍대점A","신촌점A"},
				{"강남점K","홍대점K","신촌점K"},
		};
		String inputMsg="매출액을 입력하세요";
		
		
		for(int i=0;i<rLength; i++) {
			for(int j=0;j<cLength;j++) {
				arrIncome[i][j]=Integer.parseInt(JOptionPane.showInputDialog(arrName[i][j]+inputMsg));
				arASum[i]+=arrIncome[i][j];
				arBSum[j]+=arrIncome[i][j];
				sum+=arrIncome[i][j];
			}
		}
		//연령별 평균
		for(int i=0;i<aAvg.length; i++) {
			aAvg[i]=Double.parseDouble(String.format("%.2f", (double)arASum[i]/arBSum.length));
		}
		//지점별 평균4
		for(int i=0;i<bAvg.length;i++) {
			bAvg[i]=Double.parseDouble(String.format("%.2f", (double)arBSum[i]/arASum.length));
		}		
		avg=Double.parseDouble(String.format("%.2f",(double)sum/(rLength*cLength)));
		
		for(int i=0;i<rLength; i++) {
			for(int j=0;j<cLength;j++) {
				//각지점 매출액
				result+=arrName[i][j]+"매출액:"+arrIncome[i][j]+"만원\n";
			}
				//연령별 매출액4
			 	result+=arAName[i]+"별 총 매출액"+arASum[i]+"만원\n";
			 	result+=arAName[i]+"별 평균 매출액"+aAvg[i]+"만원\n";
			}
			//지점별 매출액
			for(int i=0;i<arBSum.length;i++) {
				result+=arBName[i]+"총 매출액 :" +arBSum[i]+"만원\n";
				result+=arBName[i]+"평균 매출액 :" +bAvg[i]+"만원\n";
			}
			
			result+="총 매출액"+sum+"만원\n";
			result+="평균 매출액"+avg+"만원\n";
			
			JOptionPane.showMessageDialog(null,result);
	}

	}

결과