Java get prime number

for (int i = 2; i <= 1000; i++) {  
                    boolean flag = true;  
                    for (int j = 2; j < i; j++) {  
                        if (i % j == 0) {  
                            flag = false;  
                            break;  
                        }  
                    }  
                    if (flag) {  
                        System.out.print(" " + i);  
                    }  
                }

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