以下代码的运行结果为:( ) public class Ex 1 { public static void main(String[] args ) { int total =0; for ( int i =0, j =10; total >30;++ i ,-- j ){ System. out .println( "i=" + i + ":j=" + j ); total +=( i + j ); } System. out .println( "Total " + total ); } }