1.Run -> Run Configurations -> Arguments -> VM arguments文本框中加上断言开启的标志:-enableassertions 或者-ea
2.在myEclipse中,Windows -> Preferences ->Java ->Installed JREs ->点击正使用的JDK ->Edit ->Default VM Arguments文本框中输入:-ea
例子:
public class Lmt03 {
public static void main(String[] args) {
int [] score = { -120,98,89,120,99};
int sum = 0;
for (int number : score) {
assert number>=0:"负数不能是成绩。";
sum = sum+number;
}
System.out.println("总成绩:"+sum);
}
}