execvp()函数的问题

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#include <cstdio>
#include <unistd.h>
using namespace std;
int main(){
    char buf[80];
    getcwd(buf,sizeof(buf));
    printf("current working directory: %s\n", buf);
    chdir("/home/keane/Judge/temp");
    getcwd(buf,sizeof(buf));
    printf("current working directory: %s\n", buf);
    char *array[3];
    array[0] = "java";
    array[1] = "Main";
    array[2] = NULL;
    execvp("java", array);
    return 0;
}

输出路径显示已经切换目录过去了，而且下面也确实有 Main.class，但是我这样执行就显示错误: 找不到或无法加载主类 Main

求解

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