java - Unreachable code error with no return -

i have program working on , started getting unreachable code errors @ return in columns() method. tried line , won't unreachable code. line "return obj" line can't reached. code below:

public class display {  public static void main(string[] args){     int x,y;     for(int = 1; < 5; a++){         system.out.print(a + "\t");     }      system.out.println();     for(int = 0; < 10; i++){         y = i;         x = 1;         for(int z = 0; z < 4; z++) {             system.out.print(x*y + "\t");             x++;         }     system.out.println();        } }  public static object[] columns() {       object[] obj;     obj = new object[11];     obj[0] = "x = 1, 2, 3, 4";     for(int o = 0; 0 < 10;o++){         obj[o+1] = "x * " + o;     }     return obj; } } 

your problem here:

for(int o = 0; o < 10;o++){     obj[o+1] = "x * " + o; } return obj; 

you using 0<10 loop never ends.