二维数组转稀疏数组(一维数组)，稀疏数组转二维数组。

二维组转稀疏数组，稀疏数组转二维数组。(本文章用一维数组写稀疏数组，有兴趣的小伙伴也可以全部用一维写)，当然小编也没有对一些代码进行封装，有兴趣的小伙伴也可以自行封装。

直接上代码：

代码

package com.java.test;

import java.util.Arrays;

public class TwoArrays {
	public static void main(String[] args) {
		int [][] ary = new int [5][4];
//		ary[0][9]=4;
		ary[1][2]=2;
//		ary[9][4]=1;
//		ary[5][8]=13;
		for (int i = 0; i < ary.length; i++) {
			for (int j = 0; j < ary[0].length; j++) {
				System.out.print(ary[i][j]+"\t");
			}
			System.out.println();
		}
		System.out.println("二维数组转稀疏数组");
		//有兴趣的小伙伴可以将它写成动态数组，就不会像小编这样浪费空间了
		int [] sop = new int [(ary.length*ary[0].length*3)+3];
		sop[1] = ary.length;
		sop[2] = ary[0].length;
		int count=0;
		int x=3;
		for (int i = 0; i < ary.length; i++) {
			for (int j = 0; j < ary[0].length; j++) {
				if(ary[i][j]!=0) {
					sop[x]=i;
					++x;
					sop[x]=j;
					++x;
					sop[x]=ary[i][j];
					++x;
					count++;
				}
			}
		}
		int allsize=0;
		sop[0]=count;
		int size=0;
		for (int i = 0; i <=count; i++) {
			for (int j = 0; j <3; j++) {
				System.out.print(sop[size]+"\t");
				size++;
				allsize++;
			}
			System.out.println();
		}
		System.out.println("稀疏数组转二维数组");
		int x1=0;
		int y1=1;
		int number=2;
		int [] [] twoArrays= new int [sop[y1]] [sop[number]];
		for (int i = 0; i < allsize; i++) {
			x1+=3;
			y1+=3;
			number+=3;
			twoArrays[sop[x1]][sop[y1]]=sop[number];
		}
		for (int i = 0; i < twoArrays.length; i++) {
			for (int j = 0; j < twoArrays[0].length; j++) {
				System.out.print(twoArrays[i][j]+"\t");
			}
			System.out.println();
		}
	}
}

总结

String a =“继续学习，使我们的知识更加丰富。”;
System.out.printf("%s",a);

本文地址：https://blog.csdn.net/weixin_47462332/article/details/109807627