数组基础练习

Posted 2020-08-29 Co_米波

public class testDemo {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int data[][] = new int[][]{{1,2,3,4},{5,6,7,8},{9,3,6,1},{8,2,2,8}};
        for(int row=0;row<4;row++){
            for(int col=0;col<4;col++){
                System.out.print(data[row][col]+",");
            }
            System.out.println();
        }
        
        System.out.println();
        transpose(data);
        for(int i=0;i<4;i++){
            for(int j=0;j<4;j++){
                System.out.print(data[i][j]+",");
            }
            System.out.println();
        }
    }
    
    
    //二维数组行列转置
    public static int[][] transpose(int[][] temp){
        int exchange=0;
            for(int x=0;x<temp.length;x++){
                for(int y=x;y<temp[x].length;y++){
                    exchange=temp[x][y];
                    temp[x][y]=temp[y][x];
                    temp[y][x]=exchange;
                }
            }
        return temp;
    }
    
    //查找数组中的数字
    public static boolean search(int[] temp,int num){
        for(int i=0;i<temp.length;i++){
            if(temp[i]==num){
                return true;
            }
        }
        return false;
    }
    
    //排序
    public static int[] sort(int[] temp){
        int x=0;
        for(int n=0;n<temp.length;n++){
            for(int i=0;i<temp.length-1;i++){
                if(temp[i]>temp[i+1]){
                    x=temp[i];
                    temp[i]=temp[i+1];
                    temp[i+1]=x;
                }
            }
        }
        
        return temp;
    }
    
    //一维数组反转
    public static int[] convert(int[] temp){
        int exchange=0;
        if(temp.length%2==0){
            for(int i=0;i<temp.length/2;i++){
                exchange=temp[i];
                temp[i]=temp[temp.length-i-1];
                temp[temp.length-i-1]=exchange;
            }
        }else{
            for(int j=0;j<Math.round(temp.length/2);j++){
                exchange=temp[j];
                temp[j]=temp[temp.length-j-1];
                temp[temp.length-j-1]=exchange;
            }
        }
        
        return temp;
    }

}