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.java files are not executable, they are just source files. .class files are compiled java files, which can be ran from the command line. However, if you want a file you can double-click and run, you...

for(int i = 1; i < 50; 1++) { nums[i] = i; }

for(int i = 1; i < 50; 1++)

I think you mean those to be i++ not 1++