数组判断大小

string类型排序

package dasd;

public class bijao {

public static void main(String[] args) {
    // TODO Auto-generated method stub

    String[] a = {"10", "55", "45"};
    if (a == null  a.length == 0){
    return;
    }
    String min = a[0];
    String max = a[0];
    int len = a.length;

    for(int i=0; i<a.length; i++){
    if (len < min.length()){
    min = a[i];
    System.out.println("最值小是"+min);
    }else if(len > max.length()){
    max = a[i];
    System.out.println("最值大"+max);
    }





}

}

}

int类型排序

package dasd;

public class intlleix {

public static void main(String[] args) {
    // TODO Auto-generated method stub
  int arr[]= {4,5,56,8,9,6,2,};
  int max=0;
  int min=100;
  for(int i=0;i<=arr.length-1;i++) {
      if(arr[i]>max) {
          max=arr[i];
      }
      if(arr[i]<min) {
          min=arr[i];
      }
      System.out.println(max+" "+min);
  }
}

}

倒序练习

package dasd;

public class paixni {

public static void main(String[] args) {
    // TODO Auto-generated method stub

    int arr[]= {2,34,5,6,7};
    int a= arr.length/2;

// System.out.println(a);
for (int i=0;i<a;i++) {
int x=arr[i];
arr[i]=arr[arr.length-1-i];
arr[arr.length-1-i]=x;

    }
    for(int y=0;y<arr.length;y++) {
        System.out.println(arr[y]);
    }
}

}