java数组中的数字相加

//使用一个循环，累加循环变量即可
int[] Day1={31,28,31,30,31,30,31,31,30,31,30,31};
int sum = 0;
for(int i : Day1){
sum += i;
}
System.out.println(sum);

public class Test2 {

public static void main(String[] args) {

int []Day1={31,28,31,30,31,30,31,31,30,31,30,31};

int sum = 0;
for(int i = 0; i < Day1.length;i++){
sum = sum + Day1[i];
}

System.out.println(sum);
}

}

public static void main(String[] args) throws Exception{
int []Day1={31,28,31,30,31,30,31,31,30,31,30,31};
int sum = 0;
for(int a:Day1){
sum+=a;
}
System.out.print(sum);
}

int []Day1={31,28,31,30,31,30,31,31,30,31,30,31};
int p=0;
for(Integer c:Day1)
p+=c;
System.out.print(p);