TesterSecurityManager.java 文件源码

private boolean checkNetPermission(final NetPermission perm) {
    // Allow only if called from a safe caller or JUnit
    return calledFromJUnit()
            || calledFromSafeCallers()
            || calledFrom("java.text.NumberFormat", "java.", "sun.")
            || calledFrom("java.awt.Toolkit", "java.", "sun.");
}